HEPAL

This is a list of acronyms, abbreviations and similar stuff that I've had to look up or remember over the years, mostly due to reading hep-lat, hep-ph and hep-th arXiv postings. It is organized alphabetically rather than thematically. Fermilab and CTEQ have similar lists here and here.

This basic list has largely been superseded by the High Energy Physics Acronym Dictionary constructed by Casper van Veen and Ilya Fokin, but will continue to be updated on occasion.

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2DEG: Two-dimensional electron gas
2dFGRS: Two-degree-Field Galaxy Redshift Survey
2MASS: Two Micron All-Sky Survey
2MRS: 2MASS redshift survey
2p2h: Neutrino interactions with two nucleons producing two holes
2SC: Two-flavor color superconducting phase
3FD: Three-fluid dynamics
3VIL: Three-loop Vacuum Integral Library
6dF: 6 degree Field Galaxy Survey

A

AAdS: Asymptotically anti-de Sitter
AAMQS: Albacete, Armesto, Milhano, Quiroga-Arias and Salgado
AARM: Assay and Aquisition of Radiopure Materials
AB: Aharonov and Bohm
ABC: Abashian, Booth and Crowe
ABDK: Anastasiou, Bern, Dixon and Kosower
ABJ: Adler, Bell and Jackiw
ABJM: Aharony, Bergman, Jafferis and Maldacena
ABKM: Alekhin, Blümlein, Klein and Moch
ABMP: Alekhin, Blümlein, Moch and Placakyte parton distribution functions
ABM: Alekhin, Blümlein and Moch parton distributions
ABRACADABRA: A Broadband/Resonant Approach to Cosmic Axion Detection with an Amplifying B-field Ring Apparatus
ACAT: Advanced Computing and Analysis Techniques in Physics Research
ACBAR: Arcminute Cosmology Bolometer Array Receiver
ACD: Appelquist, Cheng and Dobrescu
ACES: Alliance for Computing at Extreme Scale partnership between Los Alamos and Sandia
ACM: Anomalous chromomagnetic moment
ACM: Association for Computing Machinery
ACME: Advanced Cold Molecule Electron electric dipole moment experiment
ACOT: Aivazis, Collins, Olness and Tung renormalization scheme
ACT: Atacama Cosmology Telescope
ACTpol: Atacama Cosmology Telescope Polarimeter
AD: Affleck and Dine
ADD: Arkani-Hamed, Dimopoulos and Dvali
ADE: Dynkin diagrams with only single lines; see page 252 of Georgi
ADHM: Atiyah, Drinfeld, Hitchin and Manin construction of instantons
ADI: Alternating direct implicit methods
ADM: Arnowitt, Deser and Misner formalism of general relativity
ADMX: Axion Dark Matter eXperiment
AEGIS: Antimatter Experiment: Gravity, Interferometry, Spectroscopy at CERN
AFM: Atomic force microscopy
AFTER: A Fixed Target ExpeRiment at the LHC
AFZ: Arutyunov, Frolov and Zamaklar
AGASA: Akeno Giant Air Shower Array
AGE: Antimatter Gravity Experiment
AGILe: A Generator Interface Library (and executable) for Monte Carlo event generators
AGIS: Advanced Gamma-ray Imaging System
AGK: Abramovsky, Gribov and Kancheli
AGN: Active galactic nuclei
AGS: Alternating Gradient Synchrotron
AGSS: Asplund, Grevesse, Sauval and Scott
AGT: Alday, Gaiotto and Tachikawa duality
AICS: RIKEN Advanced Institute for Computational Science
AION: Atom Interferometer Observatory and Network for ultra-light dark matter and gravitational waves
AIRES: AIR-shower Extended Simulations system
AIT: Advanced Instrumentation Testbed at Boulby Underground Laboratory, North Yorkshire
aITALC: an Integrated Tool for Automating Loop Calculations
AKNS: Ablowitz, Kaup, Newell and Segur
AKSZ-BV: Alexandrov, Kontsevich, Schwarz, Zaboronsky, Batalin and Vylkovisky
AL3X: A Laboratory for Long-Lived eXotics proposed LHC detector near ALICE
ALFA: Arecibo L-band Feed Array
ALICE: A Large Ion Collider Experiment
ALICE: Accelerators and Lasers In Combined Experiments at Daresbury, formerly ERL
ALICE: Imaging spectrograph aboard the New Horizons mission, not an acronym but sometimes treated as such
ALMA: Atacama Large Millimeter Array run by the NRAO
ALE: Arbitrary Lagrangian--Eulerian techniques
ALE: Asymptotically locally Euclidean
ALEPH: Apparatus for LEP PHysics
ALF: Asymptotically locally flat
ALLM: Abramowicz, Levin, Levy and Maor parameterization of the structure function F2
ALP: Axion-like particle
ALPGEN: A generator for hard multiparton processes in hadronic collisions, apparently not an acronym
ALPHA: Antihydrogen experiment at CERN
ALPS: Algorithms and Libraries for Physics Simulations
ALPS: Axion-Like Particle Search (or Any Light Particle Search) at DESY
ALR: Alternative left-right scenario
AMANDA: Antarctic Muon And Neutrino Detector Array
AMBER: Apparatus for Meson and Baryon Experimental Research proposed at CERN
AMBRE: Automatic Mellin-Barnes Representation (Mathematica package)
aMC@NLO: Automated MC@NLO code, apparently independent of MC@NLO itself
aMCfast: Interface between MadGraph5_aMC@NLO and APPLgrid
AMIAS: Athens Model-Independent Analysis Scheme for excited states in two-point functions
AMIDAS: A Model-Independent Data Analysis System for direct dark matter detection experiments
AMPT: A Multi-Phase Transport model for hadrons
AMS: Alpha Magnetic Spectrometer on the International Space Station
AMY: Arnold, Moore and Yaffe
ANAIS: Annual modulation with NaI Scintillators dark matter search project
ANDES: Agua Negra Deep Experiment Site
ANITA: Antarctic Impulsive Transient Antenna
ANKE: Apparatus for Studies of Nucleon and Kaon Ejectiles at the Jülich Cooler Synchrotron
ANL: Argonne National Laboratory
ANN: Artificial Neural Network
ANP: Adler, Nussinov and Paschos pion leptoproduction model
ANTARES: Astronomy with a Neutrino Telescope and Abyss environmental RESearch
APCTP: Asia Pacific Center for Theoretical Physics
APE: Array Processor Experiment
APEX: A-Prime EXperiment at Jlab
APFEL: A Parton distribution Function Evolution Library
APPEC: Astroparticle Physics European Consortium
APPLgrid: Code to quickly reproduce NLO results, apparently not an acronym
APT: Analytic Perturbation Theory
ARC: Applied Research Center at JLab
ARCA: Astronomy Research with Cosmics in the Abyss under construction as part of KM3NeT
ARCADE: Absolute Radiometer for Cosmology, Astrophysics and Diffuse Emission
ARES: Automated Resummer for Event Shapes semi-numerical approach
ARGO-YBJ: Astrophysical Radiation with Ground-based Observatory at YangBaJing
ArgoNeuT: Argon Neutrino Test project at Fermilab
ARGUS: A Russian--German--United States--Swedish Collaboration at DORIS
ARNPS: Annual Review of Nuclear and Particle Science
ARPA-E: Advanced Research Projects Agency-Energy
ARPES: Angle-resolved photoemission spectroscopy
ART: A Relativistic Transport model for hadrons
ASACUSA: Atomic Spectroscopy And Collisions Using Slow Antiprotons experiment at CERN
ASC: Advanced Simulation and Computing at Livermore
ASCR: Advanced Scientific Computing Research program of the DOE
ASD: Anti-self-dual
ASEP: Asymmetric simple exclusion process
ASIC: Application-specific integrated circuit
ASTROD: Astrodynamical Space Test of Relativity using Optical Devices
AT: Astronomical Transient (e.g., AT2017gfo)
ATCA: Australia Telescope Compact Array
ATF: Accelerator Test Facility at KEK
ATHENA: Antihydrogen experiment at CERN
ATHOS: Analysis Tools for next generation Hadron Spectroscopy
ATIC: Advanced Thin Ionization Calorimeter
ATK: Atomistix ToolKit Python programming environment
ATLAS: A Toroidal LHC ApparatuS at CERN
ATMNC: ATmostpheric Muon Neutrino Calculation
ATNF: Australia Telescope National Facility
AUC: Area Under the [receiver operating characteristic] Curve machine learning performance measure
AUT: Single-spin target Asymmetry with Unpolarized beam and Transversely polarized target
AVX: Advanced vector extensions
AWAKE: Advanced proton driven plasma Wakefield acceleration experiment based at CERN
AXP: Anomalous X-ray pulsar

B

B/C: Boron-to-Carbon flux ratio in cosmic rays
BAMPS: Boltzmann Approach of Multi-Parton Scatterings
BAO: Baryon Acoustic Oscillation
BaSc: Baryon Scattering lattice collaboration
BAT: Burst Alert Telescope aboard the Swift satellite observatory
BATSE: Burst and Transient Source Experiment
BAU: Baryon asymmetry of the universe
BBGKY: Bogoliubov, Born, Green, Kirkwood and Yvon
BBGLN: Beneke, Buchalla, Greub, Lenz and Nierste
BBN: Big Bang nucleosynthesis
BBO: Big Bang Observer
BBTW: Bedaque, Buchoff, Tiburzi and Walker-Loud
BCA: bremsstrahlung, Compton scattering, and axio-recombination processes
BCC: Body-centered cubic crystal structure
BCDMS: Bologna, CERN, Dubna, Munich and Saclay DIS experiment using CERN's SPS muon beam
BCFW: Britto, Cachazo, Feng and Witten
BCG: Brightest cluster galaxies
b-CGC: Impact-parameter-dependent Color Glass Condensate
BCJ: Bern, Carrasco and Johansson duality proposing that quantum gravity is a double copy of SU(3) gauge theory
BCOV: Bershadsky, Cecotti, Ooguri and Vafa
BCS: Bardeen, Cooper, and Schrieffer
BCVEGPY: An event generator for Bc meson production interfaced with VEGAS and PYTHIA
BDF: Proposed Beam Dump Facility at CERN
BdG: Bogoliubov and de Gennes
BDI: Chiral orthogonal topological insulator symmetry class, not an acronym
BDic: Bunch-Davies initial conditions
BDM: Bound dark matter model
BDMPS-Z: Baier, Dokshitzer, Mueller, Peigne and Schiff; Zakharov
BDS: Bern, Dixon and Smirnov
BDT: Boosted decision tree
BDX: Beam-Dump eXperiment at Jefferson Lab
BEACH: Hyperons, Charm and Beauty Hadrons (in French?)
BEGe: Broad Energy Germanium detector
BELLA: Berkeley Lab Laser Accelerator
BEMC: Barrel Electromagnetic Calorimeter
BEPC: Beijing Electron-Positron Collider
BeppoSAX: Giuseppe Occhialini Satellite per Astronomia X
BES: Beam energy scan at RHIC
BES: Beijing Spectrometer
BES: Beisert, Eden and Staudacher
BESS: Balloon-borne Experiment with a Superconducting Spectrometer
BESS: Breaking electroweak symmetry strongly
BEST: Baksan Experiment on Sterile Neutrino
BET: Boundary effective theory
BETS: Balloon-borne Electron Telescope with Scintillating fibers
BF: "Background field" topological field theory involving two-form B and curvature form F
BF: Breitenlohner and Freedman
BFACF: Berg, Forster, Aragao, Caracciolo and Frohlich algorithm
BFKL: Balitsky, Fadin, Kuraev and Lipatov
BFLK: Bukhvostov, Frolov, Lipatov and Kuraev
BFM: Background field method
BFP: Berkeley, Fermilab and Princeton
BFRT: Brookhaven, Fermilab, Rochester and Trieste
BFSS: Banks, Fischler, Shenker and Susskind
BFV: Batalin, Fradkin and Vilkovisky
BGK: Bhatnagar, Gross and Krook
BGL: Boy, Grinstein and Lebed form factor parameterization
BGL: Branco, Grimus and Lavoura two-Higgs-doublet model
BGO: Bismuth orthogermanate
BHHRS: Brown, Harada, Holt, Rho and Sasaki
BHL: Beisert, Hernandez and Lopez
BHL: Brodsky, Huang and Lepage
BHT: Bergshoeff, Hohm and Townsend
BICEP: Background Imaging of Cosmic Extragalactic Polarization
BiCGStab: Bi-conjugate gradient stabilized
BiCGGR: Bi-conjugate gradient gap-reducing
BIM: Bouchiat, Iliopoulos and Meyer
BINP: Budker Institute of Nuclear Physics, Russia
BjPSR: Bjorken polarized sum rule
BJU: Buras, Jager and Urban
BK: Balitsky and Kovchegov
BK: Becirevic and Kaidalov
BKP: Bartels, Kwiecinski and Praszalowicz
BKT: Berezinskii, Kosterlitz and Thouless
BKY: Bando, Kugo and Yamawaki
BL Lac: BL Lacertae objects, a subclass of active galactic nuclei; BL doesn't seem to be an acronym
BLAST: Balloon-borne Large-Aperture Sub-millimeter Telescope
BLAST: Bates Large Acceptance Spectrometer Toroid
BLG: Bagger, Lambert and Gustavsson
BLKT: Boundary-localized kinetic term in (non-minimal) extra-dimensional models
BLM: Brodsky, Lepage and Mackenzie perturbation theory scale setting procedure
BLMSSM: A simple extension of the Minimal Supersymmetric Standard Model where the baryon and lepton numbers are (or just B-L is) local gauge symmetries
BLSSM: B-L Supersymmetric Standard Model
BLNP: Bosch, Lange, Neubert and Paz
BLTP: Bogoliubov Laboratory of Theoretical Physics at JINR
BMN: Berenstein, Maldacena and Nastase
BMPV: Breckenridge, Myers, Peet and Vafa
BMS: Bakulev, Mikhailov and Stefanis
BMS: Bass, Mueller and Srivastava parton cascade model code based on VNI
BMS: Bondi, Metzner and Sachs asymptotic symmetry group of general relativity
BMSSM: Beyond the Minimal Supersymmetric Standard Model
BMV: Bessis, Moussa and Villani
BOOMERANG: Balloon Observations Of Millimetric Extragalactic Radiation and Geophysics
BooNE: Booster Neutrino Experiment
BOSS: Baryon Oscillation Spectroscopic Survey
BPHZ: Bogoliubov, Parasuik, Hepp and Zimmerman
BPS: Bogomolnyi, Prasad and Sommerfield
BPSH: Blas, Pujolas, Sibiriakov and Horava
BPST: Belavin, Polyakov, Schwarz and Tyupkin classical SU(2) instanton
BR: Brown and Rho
BR: Burnier and Rothkopf bayesian reconstruction method
BRAHMS: Broad RAnge Hadron Magnetic Spectrometers experiment at RHIC
BREAD: Broadband Reflector Experiment for Axion Detection proposed at Fermilab
BRNS: Indian DAE Board of Research in Nuclear Sciences
BRpV: Bilinear R parity Violation
BRST: Becchi, Rouet, Stora, and (independently) Tyutin
BSI: British Standards Institution
BSS: Blankenbecler, Scalapino and Sugar quantum Monte Carlo algorithm
BSSN: Baumgarte, Shapiro, Shibata and Nakamura
BSV: Bajc, Senjanovic and Vissani
BSW: Bauer, Stech and Wirbel
BT: Buchmuller and Tye
BTZ: Banados, Teitelboim and Zanelli
BUU: Boltzmann, Uehling and Uhlenbeck
BV: Batalin and Vilkovisky
BW: Balkan Workshop
BZ: Ball and Zwicky

C

CAAR: Center for Accelerated Application Readiness at Oak Ridge
CAFPE: Centro Andaluz de Física de Partículas Elementales
CALET: CALorimetric Electron Telescope on the International Space Station
CAMB: Code for Anisotropies in the Microwave Background
CANGAROO: Collaboration of Australia and Nippon for a GAmma Ray Observatory in the Outback
CAPRICE: Cosmic AntiParticle Ring Imaging Cherenkov Experiment
CARLOMAT: Automatic tool for electron--positron annihilation into hadrons at low energies, apparently not an acronym
CASCADE: Monte Carlo event generator, apparently not an acronym
CASPAR: Compact Accelerator System for Performing Astrophysical Research at SURF
CAST: CERN Axion Solar Telescope
CaSToRC: Computation-based Science and Technology Research Center in Cyprus
CAT: Computed Axial Tomography
CBELSA: Crystal Barrel Detektor at the Elektronen Stretcher Anlage in Bonn
CBEA: Cell Broadband Engine Architecture
CBI: Cosmic Background Imager
CBM: Compressed Baryonic Matter experiment at FAIR/GSI
CBPF: Centro Brasileiro de Pesquisas Físicas (Brazilian Center for Research in Physics)
CCB: Charge and color breaking
CCD: Charge-coupled device
CCDM: Creation of cold dark matter (a cosmological model)
CCF: Combinatorial collapse filter
CCFM: Ciafaloni, Catani, Fiorani and Marchesini evolution equation
CCFM-K: Catani, Ciafaloni, Fiorani, Marchesini and Kwiecinski evolution equation
CCFR: Chicago, Columbia, Fermilab and Rochester
CCQE: Charged current quasielastic scattering
CCPR: Computer Center Problem Reporting at JLab
CCR: Canonical commutation relations
CCWZ: Callan, Coleman, Wess and Zumino
cD: central Dominant galaxy
CDD: Castillejo, Dalitz, and Dyson
CDER: Cluster-decomposition error reduction technique
CDEX: China Dark Matter Experiment
CDF: Collider Detector at Fermilab
CDF: Combinatorial drop filter
CDHS: CERN, Dortmund, Heidelberg and Saclay neutrino experiment
CDHSW: CERN, Dortmund, Heidelberg, Saclay and Warsaw neutrino experiment
CDL: Coleman and De Luccia
CDMS: Cryogenic Dark Matter Search
CDMS: Constrained dark matter singlet
CDP: CERN, Dubna and Protvino
CDR: Conceptual Design Report
CDR: Conventional dimensional regularization
CDT: Causal dynamical triangulation
CDW: Charge-density wave
CEA: Commissariat a l'energie atomique
CEBAF: Continuous Electron Beam Accelerator Facility
CEDAR: Combined e-Science Data Analysis Resource for high-energy physics
CEDM: Chromo-electric dipole moment
CEE: Mathematics Centre for Enhancement in Education
CEEX: Coherent exclusive exponentiation
CELLO: Not an acronym, particle detector at DESY's PETRA
CELSIUS: Cooling with ELectrons and Storing of Ions from the Uppsala Synchrocyclotron
CENTRA: Centro Multidisciplinar de Astrofísica at the Instituto Superior Técnico Lisboa
CEP: Critical end point
CEPC: Circular Electron Positron Collider proposed in China
CESR: Cornell Electron Storage Ring
CETUP: Center for Theoretical Underground Physics
CE$\nu$NS: Coherent Elastic Neutrino--Nucleus Scattering
CFF: Compton form factor
CFHT: Canada-France-Hawaii telescope
CFHTLenS: Canada-France-Hawaii Telescope Lensing Survey
CfA: Harvard--Smithsonian Center for Astrophysics redshift survey
CFL: Color-flavor-locked
CFNS: Center for Frontiers in Nuclear Science at Stony Brook
CGC: Clebsch--Gordan coefficient
CGC: Color glass condensate
CGLN: Chew, Goldberger, Low and Nambu
CGNE: Conjugate gradient on the normal equations
CGNR: Conjugate gradient normal residual
CGRO: Compton Gamma Ray Observatory
CHAMP: CHArged Massive Particle
ChaNGa: Charm N-body Gravity solver
CHAOS: Canadian High Acceptance Orbit Spectrometer at TRIUMF
CHAOS: Clustered High Availability Operating System
CHARM: CERN, HAmburg, Rome and Moscow Neutrino Experiment at the CERN SPS
CHASE: Chameleon Afterglow Search
CheckMATE: Check Models At Terascale Energies program
chGOE: Chiral gaussian orthogonal ensemble
chGSE: Chiral gaussian symplectic ensemble
chGUE: Chiral gaussian unitary ensemble
Chi Nu: Neutron detector at LANSCE, acronym unknown
CHIME: Canadian Hydrogen Intensity Mapping Experiment
CHIMERA: Comprehensive Hydrodynamical Integrated Modelling Evaluation and Reporting Algorithm
CHIPS: CHerenkov detectors In mine PitS experiment using Fermilab neutrinos
CHIRON: Package for two-loop numerical chiral perturbation theory, apparently not an acronym
CHL: Central Helium Liquefier at Jlab
CHL: Chaudhuri, Hockney and Lykken
CHORUS: CERN Hybrid Oscillation Research apparatUS
CHORUS: Clearinghouse for the Open Research of the United States
ChPT: Chiral perturbation theory
CHY: Cachazo, He and Yuan
CI: Chirally improved
CIBJET: Event-by-event generalization of CUJET, acronym unknown
CICY: Complete Intersection Calabi--Yau manifolds
CiDM: Composite inelastic dark matter
CII: Astronomical zone in which hydrogen is fully molecular but carbon is ionized
CIMBA: Cubic Interpolation for Minimum Bias Approximation Monte Carlo event generator
CINVESTAV: Mexican Centro de INVestigación y de ESTudios AVanzados del Instituto Politécnico Nacional
CIPANP: Conference on the Intersections of Particle and Nuclear Physics
CIPT: Contour-improved perturbation theory
CITA: Canadian Institute for Theoretical Astrophysics
CJPL: China Jin-Ping underground Laboratory
CJT: Cornwall, Jackiw and Tomboulis
CKKU: Cohen, Kaplan, Katz and Unsal
CKKW: Catani, Krauss, Kuhn and Webber
CKM: Cabibbo, Kobayashi and Maskawa
CKN: Cohen, Kaplan and Nelson
CKS: Carcamo, Kovalenko and Schmidt mechanism for SM flavor hierarchy
CLAF: Latin American Center for Physics in Rio de Janeiro
CLAFEX: Cosmology and High Energy Physics Laboratory
CLARA: Compact Linear Accelerator for Research and Applications at Daresbury
CLAS: CEBAF Large Acceptance Spectrometer
CLASS: Cosmic Lens All-Sky Survey
CLASS: Cosmic Linear Anisotropy Solving System code
CLEAN: Cryogenic Low-Energy Astrophysics with Noble gases
CLEO: Not an acronym, detector at CESR
CLEO: Conference on Lasers and Electro-Optics
CLF: Central Laser Facility at Harwell
cLFV: Charged lepton flavor violating observables
CLIC: Compact Linear Collider
CLICdp: Compact Linear Collider Detector and Physics Collaboration
CLICHE: CLIC Higgs Experiment
CLN: Caprini, Lellouch and Neubert form factor parameterization
CLQCD: Chinese Lattice QCD Collaboration
CLS: Coordinated Lattice Simulations
CLUES: Constrained Local UniversE Simulations
CMASS: "Constant mass" galaxies in the Sloan Digital Sky Survey
CMD: Cryogenic Magnetic Detector at VEPP
CMFV: Constrained minimal flavor violation
CMIT: Liverpool's Centre for Mathematical Imaging Techniques
CMOS: Complementary metal-oxide-semiconductor
CMS: Compact Muon Solenoid experiment at CERN
CMSSM: Minimal supersymmetric standard model constrained so that the scalar and gaugino masses are universal at the GUT scale
CMTF: Cryomodule Test Facility at Fermilab
CNGS: CERN Neutrinos to Gran Sasso
CNI: Computing and Networking Infrastructure
CNM: Cold nuclear matter
CNMSSM: Constrained next-to-minimal supersymmetric standard model
CNRS: Centre National de la Recherche Scientifique
CnuB: Cosmic Neutrino Background
COBE: Cosmic Background Explorer satellite
CoDECS: Coupled Dark Energy Cosmological Simulations database
CODEX: COsmic Dynamics and EXo-earth experiment spectrograph for the E-ELT
CODEX-b: COmpact Detector for EXotics at LHCb proposed for Run3
CoGeNT: Coherent Germanium Neutrino Technology
COHERENT: Elastic neutrino--nucleus scattering experiment at SNS, apparently not an acronym
COLLAPS: COLlinear LAser SPectroscopy [sic] experiment at ISOLDE
COLLIER: Complex One-Loop Library In Extended Regularisations
CoLoRFulNNLO: Completely Local subtRactions for Fully differential predictions at NNLO
COMET: COherent Muon Electron Transition experiment at J-PARC
COMPASS: COmmon Muon Proton Apparatus for Structure and Spectroscopy
COMPETE: COmputerized Models, Parameter Evaluation for Theory and Experiment
COMPTEL: Imaging Compton Telescope
CORE: Cosmic ORigins Explorer proposed satellite
CoRoT: Convection Rotation and planetary Transits
CORSIKA: COsmic Ray SImulations for KAscade program
COSINE: Dark matter experiment run by DM-Ice in collaboration with the Korea Invisible Mass Search, apparently not an acronym
COSINUS: Cryogenic Observatory for SIgnatures seen in Next-generation Underground Searches proposal
CosmoMC: Cosmological Monte Carlo
CoSMoN: Connecting the Standard Model to Nuclei lattice collaboration
CosPA: Cosmology and Particle Astrophysics
COSY: Cooler Synchrotron at Jülich
COUPP: Chicagoland Observatory for Underground Particle Physics
COW: Colella, Overhauser and Werner
CP^{N-1}: Complex projective model in SU(N)/U(N-1)
CPL: Chevallier, Polarski and Linder parameterization of dark energy
CP-PACS: Computational Physics by Parallel Array Computer System
CPX: Supersymmetric CP-violating benchmark scenario
cQPA: Coherent quasiparticle approximation
COBRA: Cadmium zinc telluride 0-neutrino double-Beta Research Apparatus at Gran Sasso
CORAL: Collaboration of Oak Ridge, Argonne and Lawrence Livermore national labs
COST: European Cooperation in Science and Technology framework
CQSM: Chiral quark soliton model
CPAD: Coordinating Panel for Advanced Detectors
CPW: Coplanar Waveguide
CR: Cauchy and Riemann
CR&D: Collaborative research and development
CREAM: Cosmic Ray Energetics And Mass
CRES: Cyclotron Radiation Emission Spectroscopy
CRESST: Cryogenic Rare Event Search with Superconducting Thermometers
CREST: Cosmic Ray Electron Synchrotron Telescope
CRID: Cherenkov Ring Imaging Detector, part of SLD
CRIRES: CRyogenic high-resolution InfraRed Echelle Spectrograph for ESO's VLT
CSA: Coordination and Support Action of the European Commission
CSBP: Continuous-state branching process
CSC: ATLAS Computing System Commissioning
CSD2: Constrained Sequential neutrino Dominance of type 2
CSE: Computational Science and Engineering
CSIC: Spanish Consejo Superior de Investigaciones Científicas
CSL: Continuous spontaneous localization
CSO: Cryogenic sapphire oscillator
CSP: Computer Security Program at Livermore
CSP: Concentrated solar power
cSMCS: Constrained Standard Model extended by a Complex Singlet scalar
CSS: Collins, Soper and Sterman
CSSHOWER: Color-coherent showering description in SHERPA, based on Catani--Seymour dipole factorization
CSSM: Centre for the Subatomic Structure of Matter (Australia)
CSTB: Coupled Scalar--Tachyon Bounce cosmological model
CSW: Cachazo, Svrcek, and Witten
CT: CTEQ-TEA parton distribution functions
CT: Computed tomography
CTA: Cherenkov Telescope Array
CTEQ: Coordinated Theoretical--Experimental Project on QCD
CTF: Counting Test Facility at Gran Sasso
CTP: Closed time path formalism of Schwinger and Keldysh
CTR: Controlled thermonuclear reactor
CTS: Commodity Technology System at Livermore
CUORE: Cryogenic Underground Observatory for Rare Events at Gran Sasso
CUDA: No longer an acronym, formerly Compute Unified Device Architecture
CUJET: Columbia University jet quenching Monte Carlo
CUSP: Magnetic field configuration used by ASACUSA, apparently not an acronym though sometimes treated as such
CUSTIPEN: China--US Theory Institute for Physics with Exotic Nuclei
CVC: Conserved vector current
CVD: Chemical vapor deposition
CVMN: Chamseddine and Volkov, later Maldacena and Nunez
CW: Closure-finite weak topology
CW: Coleman and Weinberg
CWoLa: Classification Without Labels machine learning method
CXC: Chandra X-ray Center
CXO: Chandra X-ray Observatory
CYGNO: CYGNUS TPC with Optical readout
CYGNUS: Directional dark matter search proposal, apparently not an acronym
CZ: Convective zone (for instance of the sun)

D

DA: Distribution amplitude (wave function integrated over transverse momentum with fixed longitudinal momentum fraction)
DAC: Development Assistance Committee of the OECD
DAE: Indian Department of Atomic Energy
DAEdALUS: Decay-At-rest Experiment for delta_CP studies At the Laboratory for Underground Science
DAF: Deterministic annealing filter
DANCE: Detector for Advanced Neutron Capture Experiments at LANL
DARWIN: DARk matter WImp search with Noble liquids
DAT: Dedicated application time
DAV: Type of variable white dwarf star, with spectral type DA (only hydrogen absorption)
DAFNE: Double Annular Factory for Nice Experiments at Frascati
DAMA/LIBRA: DArk MAtter Large sodium Iodide Bulk for RAre processes experiment
DAMIC: Dark Matter In CCDs experiment
DAMPE: DArk Matter Particle Explorer satellite launched in 2015
DARMA: De Angelis, Roncadelli and Mansutti
DART: NASA's Double Asteroid Redirection Test
DAS: Double asymptotic scaling approximation
DASI: Degree Angular Scale Interferometer
DBD: Detailed Baseline Design for the ILC
DBESS: Degenerate breaking electroweak symmetry strongly
DBI: Dirac, Born and Infeld
DBR: Differential branching ratio
DBV: Type of variable white dwarf star, with spectral type DB (only helium absorption)
DBW2: Doubly blocked from Wilson action in two coupling space
DCC: Disoriented Chiral Condensate
DCC: Dynamical coupled channels
DCE: Dynamical Casimir effect
DCP: Deconfined critical point
DCT: Discrete cosine transform
DCV: Desktop Cloud Visualization
dDGLAP: double DGLAP framework for double PDFs
DDH: Desplanques, Donoghue and Holstein
DDM3Y: Density-Dependent Michigan 3-range Yukawa effective interaction
DDVCS: Double deeply virtual Compton scattering
DEAP: Dark matter Experiment with Argon and Pulse shape discrimination
DEC: Discrete exterior calculus
DECam: Dark Energy Camera on the Blanco Telescope
DECaLS: DECam Legacy Survey
DECIGO: DECI-hertz interferometer Gravitational wave Observatory
DeeMe: Muon experiment at J-PARC, acronym unknown
DELPHES: Detector simulation code, apparently not an acronym
DELPHI: Detector with Lepton, Photon and Hadron Identification
DES: Dark energy survey
DESI: Dark Energy Spectroscopic Instrument
DESY: Deutsches Elektronen Synchrotron
DETF: Dark Energy Task Force
DFELL: Duke Free-Electron Laser Laboratory
DFG: Deutsche Forschungsgemeinschaft (German Research Foundation)
DFR: Doplicher, Fredenhagen and Roberts
DFSZ: Dine, Fischler, Srednicki and Zhitnitsky
DFT: Discrete Fourier transform
DGLAP: Dokshitzer, Gribov, Lipatov, Altarelli and Parisi
DGLAP-CS: Dokshitzer, Gribov, Lipatov, Altarelli, Parisi, Callan and Symanzik
DGLV: Djordjevic, Gyulassy, Levai and Vitev
DGP: Dvali, Gabadadze and Porrati braneworld model
DGR: Deryagin, Grigoriev and Rubakov
DHF: Dark Matter, Hadron Physics and Fusion Physics conference
DHM: Dorey, Hofman and Maldacena
DHM: Double Higgs Model
DHOST: Degenerate Higher-Order Scalar--Tensor modified gravity
DIANA: Xenon bubble chamber at IHEP, acronym unknown
DIANA: Dakota Ion Accelerators for Nuclear Astrophysics proposed for DUSEL
DIANA/HEP: Data Intensive ANAlysis for High Energy Physics project
DIAS: Dubna International Advanced School
DIANE: DIstributed ANalysis Environment
DiRAC: Distributed Research utilising Advanced Computing in the UK
DIRAC: DImeson Relativistic Atom Complex at CERN
dIrr: Dwarf Irregular galaxy
DKP: Duffin, Kemmer and Petiau
DKS: Dymarsky, Kuperstein and Sonnenschein
DLCQ: Discrete Light-Cone Quantization
DLS: Diamond Light Source at Harwell
DLS: DiLepton Spectrometer experiment
DM-Ice: Sodium iodide (thallium) dark matter direct detection experiment in the South Pole ice
DMA: Direct memory access
DMFA: Slovenian Society of Mathematicians, Physicists and Astronomers (Drustvo matematikov, fizikov in astronomov)
DMRG: Density matrix renormalization group tensor network method
DMS: Data Movement and Storage department at Fermilab
DMTPC: Dark Matter Time Projection Chamber experiment
DNDO: Domestic Nuclear Detection Office in the Department of Homeland Security
DONUT: Direct Observation of the NU Tau experiment at Fermilab
DORIS: DOppel-RIng Speicher (double-ring storage) at DESY
DP: Data parallelism
DPD: Double parton distribution
DPDF: Diffractive parton distribution function
dPDF: Double parton distribution function
DPMJET: Monte Carlo code based on the Dual Parton Model
DPR: Dilepton production rate in quark--gluon plasma
DPT: Dispersively improved perturbation theory
DR: Data release
DR3: Simultaneous modelling of D-term (DT) scalar mass splitting, right-handed neutrino (RHN) Yukawa coupling effects, and mass splitting between the third generation and first two generations of matter scalars (3GS)
DRA: Method of multiloop integral evaluation based on D-dimensional Recurrence relations and Analytical properties as a function of D
DRbar: Modified Dimensional Reduction
DRED: Dimensional reduction
DREG: Dimensional regularization
DREENA-B: Dynamical Radiative and Elastic ENergy loss Approach for medium modeled by Bjorken expansion code
DREENA-C: Dynamical Radiative and Elastic ENergy loss Approach for Constant-temperature QCD medium code
dRGT: de Rham, Gabadadze and Tolley massive gravity theory
DSE: Dyson--Schwinger equation
DSIT: Department for Science, Innovation and Technology in the UK
dSph: Dwarf Spheroidal galaxy
DSR: Doubly or deformed Special Relativity
DSSM: Delta-deformed Supersymmetric Standard Model
DSSV: De Florian, Sassot, Stratmann and Vogelsang helicity parton densities global fit
DSTL: Defence Science and Technology Laboratory in the UK
DTRA: Defense Threat Reduction Agency
DTT: Divergence-type theory
DUNE: Deep Underground Neutrino Experiment
DURA: Deep Underground Research Association
DUSEL: Deep Underground Science and Engineering Laboratory
DV: Duality violation (terms potentially complementing the OPE)
DVCS: Deeply Virtual Compton Scattering
DVMP: Deeply Virtual exclusive Meson leptoProduction
DVZ (or vDVZ): van Dam, Veltman and (independently) Zakharov
DWARF: Debugging With Arbitrary Record Formats standard
DWIA: Directed wave impulse approximation

E

EADL: Evaluated Atomic Data Library
EAIM: An exact analytical iteration method
EAS: Extensive air shower
EAS-MSU: Telescope array run by Moscow State University to detect and analyze extensive air showers
EBAC: Excited Baryon Analysis Center at Jlab
EBEX: E and B Experiment balloon-borne CMB telescope
EBL: Extragalactic background light
eBOSS: Extended Baryon Oscillation Spectroscopic Survey
EBSD: Electron Backscatter Diffraction
EC: Electron capture
ecCNO: Electron capture reactions taking nitrogen to Carbon, oxygen to Nitrogen, and fluorine to Oxygen
ECFA: European Committee for Future Accelerators
ECHO: Eulerian Conservative High-Order code for astrophysics and QGP
ECO: Exotic compact object
ECOSMOG: Efficient COde for Simulating MOdified Gravity
ECS: ESnet Collaboration Service
ECT: European Center for Theoretical Studies in Nuclear Physics and Related Areas
ECuME: Electroplated Cuprum Manufacturing Experiment
EDD: Exclusive double diffractive
EDELWEISS: Expérience pour DEtecter Les Wimps En Site Souterrain
EDGES: Experiment to Detect the Global Epoch of reionization Signature
EDI: Equity, diversity and inclusion
EDMFT: Extended Dynamical Mean Field Theory
EDS: Elastic and diffractive scattering
E-ELT: European Extremely Large Telescope of ESO
EEX: Exclusive exponentiation
EF: Eddington and Finkelstein
EGEE: Enabling Grids for E-sciencE
EGI: European Grid Infrastructure foundation
EGM: Extended gauge model
EGO: European Gravitational Observatory
EGRB: Extragalactic gamma ray background
EGRET: Energetic Gamma Ray Experiment Telescope
EHT: Event Horizon Telescope
EIC: Electron-Ion Collider
EicC: Proposed Electron-Ion Collider in China, based on HHIAF in Huizhou
EIC: European Innovation Council
EKHARA: e+e- event generator, acronym unknown
EKRT: Eskola, Kajantie, Ruuskanen and Tuominen heavy-ion collision model
EKS: Ellis, Kunszt and Soper (code for jet distribution calculations)
EKS: Eskola, Kolhinen and Salgado
ELBNF: Experimental program at the Long-Baseline Neutrino Facility collaboration
ELDER: ELastically DEcoupling Relic dark matter
ELKO: Eigenspinoren des Ladungskonjugationsoperators (dual-helicity eigenspinors of the charge conjugation operator)
ELI: Extreme Light Infrastructure
eLISA: evolved Laser Interferometer Space Antenna, also known as NGO
ELISe: ELectron Ion scattering in a Storage ring (eA-collider) experiment at FAIR
ELPH: Research Center for ELectron PHoton Science at Tohoku University
ELSA: Elektronen Stretcher Anlage in Bonn
eLSM: Extended Linear Sigma Model
EMC: European Muon Collaboration
EMCCD: Electron multiplication charge-coupled device
EMMA: Electron Machine with Many Applications accelerator at Daresbury
EMMI: ExtreMe Matter Institute
EMPIC: Electromagnetic particle-in-cell
EMSSM: MSSM with Environmentally selected dark matter
ENC: Electron-Nucleon Collider
ENDF: Evaluated Nuclear Data File
ENDL: Evaluated Nuclear Data Library
ENUBET: Enhanced NeUtrino BEams from kaon Tagging proposed facility
EOGM: Extra-ordinary gauge mediation
EoR: Epoch of Reionization
EP: Event plane
EPAC: Extreme Photonics Applications Centre at the CLF at Harwell
EPAPS: Electronic Physics Auxiliary Publication Service
EPCC: Edinburgh Parallel Computing Centre
EPECUR: pi-p elastic scattering experiment at ITEP, acronym unknown, Russian for Epicurus
EPIC: Einstein Polarization Interferometer for Cosmology
EPICS: Experimental Physics and Industrial Control System
EPIQS: Emergent Phenomena In Quantum Systems
EPM: Ephemerides of Planets and the Moon
EPN: European Photon and Neutron campus in Grenoble
EPNJL: Entangled Polyakov, Nambu and Jona-Lasinio model
EPOS: Hadronic interaction model with Energy conserving quantum mechanical multiple scattering approach, based on Parton ladders, Off-shell remnants and Splitting of parton ladders
EPoSS: European Technology Platform on Smart Systems Integration policy initiative
EPPCN: European Particle Physics Communication Network
EPPS: Eskola, Paakkinen, Paukkunen and Salgado
EPS: Eskola, Paukkunen and Salgado
EPTA: European Pulsar Timing Array
ePUMP: Error PDF Updating Method Package code
eQPA: Extended quasiparticle approximation
ERA: European Research Area (e.g., QuantERA)
ERBL: Efremov, Radyushkin, Brodsky and Lepage
ERE: Effective range expansion
ERE: Encuentros Relativistas Españoles
ERL: Energy Recovery Linac at Daresbury, renamed ALICE
EROS: Expérience pour la Recherche d'Objets Sombres microlensing survey
eROSITA: X-ray instrument for Russian--German Spektr-RG space observatory, superseding ROSAT
ESA: European Space Agency
ESAAB: DOE Energy Systems Acquisition Advisory Board
ESD: Education for Sustainable Development
ESFRI: European Strategy Forum on Research Infrastructures
ESG: Environmental, Social and Governance strategy
ESI: Erwin Schrodinger International Institute for Mathematical Physics
ESNet: Energy Sciences Network
ESO: European Southern Observatory
ESPRESSO: Echelle SPectrograph for Rocky Exoplanet- and Stable Spectroscopic Observations
ESRF: European Synchrotron Radiation Facility
ESRL: Earth System Research Laboratory of NOAA
ESS: European Spallation Source in Sweden
ESSFSM: Extended Singlet Scalar Fermionic Standard Model
ESSnuSB: European Spallation Source Neutrino Super Beam
ESSENCE: Equation of State: SupErNovae trace Cosmic Expansion
ETH: Swiss Federal Institute of Technology (Eidgenössische Technische Hochschule) in Zurich, and a pion--nucleon scattering model developed there
ETI: NNSA Consortium for Enabling Technologies and Innovation
ETM: European Twisted Mass Collaboration
ETHOS: Effective THeory Of Structure Formation cosmological N-body simulations
ETP: European Technology Platform
ETQS: Efremov, Teryaev, Qiu and Sterman
EuCAPT: European Consortium for Astroparticle Theory
EUREKA: European Research Coordination Agency
EVN: European Very Long Baseline Interferometry Network
EWBG: Electroweak baryogenesis
EWIP: Extremely Weakly Interacting Particle
EWPT: Electroweak phase transition
EWPT: Electroweak precision tests
EWSB: Electroweak symmetry breaking
EXO: Enriched Xenon Observatory
EYM: Einstein, Yang and Mills

F

FACET: Facility for Advanced Accelerator Experimental Tests at SLAC
FAIR: Facility for Antiproton and Ion Research at GSI
FAIR: Findable, Accessible, Interoperable and Reusable data
FAIRNESS: FAIR NExt generation ScientistS
FAKT: Fachausschusses für Kern- und Teilchenphysik of the Austrian Physical Society
FAPT: Fractional Analytic Perturbation Theory
FAQSC: Liverpool Faculty Academic Quality and Standards Committee
FASER: ForwArd Search ExpeRiment at the LHC
FAST: Fermilab Accelerator Science and Technology facility
FAST: Five-hundred-meter Aperture Spherical radio Telescope in China
FASTSUM: Frascati, Argonne, Seoul, Trinity, Swansea, Utah and Maynooth
FBA: Forward--backward asymmetry
FBS: Few-body system
FCAL: Collaboration to develop Forward CALorimeters for future electron--positron colliders
FCC: Face-centered cubic crystal structure
FCC: Future Circular Collider
FCHAMP: Fractionally charged massive particle
FCT: Fundação para a Ciência e a Tecnologia in Portugal
FDH: Four-dimensional helicity regularization scheme
FDR: Four Dimensional Regularization scheme
FDTD: Finite-difference time-domain
FEL: Free electron laser
FEM: Finite element method
FEN: Front-end node
FEROS: Fiber-fed Extended Range Optical Spectrograph for the MPG/ESO 2.2-meter telescope
FEWZ: Fully Exclusive W and Z production code
feynMF: LaTeX/Metafont package for drawing Feynman diagrams
feynMP: LaTeX/MetaPost package for drawing Feynman diagrams
FFLO: Fulde, Ferrel, Larkin and Ovchinnikov
FFNS: Fixed flavor number scheme
FG: Fefferman and Graham
F-GUT: F-theory Grand Unified Theory
FGCR: Flexible Generalized Conjugate Residual
FGL: Fermi Gamma-ray Large-area telescope
FGMRES: Flexible generalized minimal residual algorithm
FGMRES-DR: Flexible generalized minimal residual algorithm deflated restarted
FGY: Frampton, Glashow and Yanagida
FHL: Fermi Large Area Telescope Catalog of High-Energy Sources
FHSV: Ferrara, Harvey, Strominger and Vafa
FI: Fayet and Iliopoulos
FIESTA: Feynman Integral Evaluation by a Sector decomposiTion Approach
FIMP: Feebly Interacting Massive Particle
FImP: Feebly Interacting light Particle
FiO/LS: Frontiers in Optics / Laser Science conference
FIRAS: Far Infrared Absolute Spectrophotometer
FIRE: Feynman Integral REduction Mathematica package
FIS: File Interchange Service at Livermore
FJPPL: France Japan international-associated Particle Physics Laboratories
FK: Fortuin and Kasteleyn random cluster model
fKLN: Factorized Kharzeev, Levin and Nardi model for pre-equilibrium phase
FKPPL: France Korea international-associated Particle Physics Laboratories
FKS: Feldman, Kroll and Stech
FKS: Forshaw, Kerley and Shaw
FKS: Frixione, Kunszt and Signer subtraction
FKTUY: Fujiwara, Kugo, Terao, Uehara and Yamawaki
FL: Friedberg and Lee
FLAG: Flavour Lattice Averaging Group
FLASY: Workshop on FLAvour SYmmetries
FLHA: Flavor Les Houches Accord
FLIC: Fat Link Irrelevant Clover
FLRW: Friedmann, Lemaître, Robertson and Walker
FLUKA: FLUktuierende KAskade (fluctuating cascade) Monte Carlo package
FMO: Friedland, McKellar and Okuniewicz
FOA: Funding Opportunity Announcement
FONLL: Method originally based on combining Fixed (second) Order and Next-to-Leading Log calculations; now used more generally to combine fixed-order and resummed calculations
FOM: Figure of Merit
FOM: Full orthogonalization method
FOPI: Four-pi detector at GSI
FOPT: Fixed-order perturbation theory
FORM: Symbolic manipulation system, apparently not an acronym
FortEPiaNO: FORTran-Evolved PrimordIAl Neutrino Oscillations code
FPGA: Field-programmable gate array
FPY: Fission product yield
FR: Fanaroff and Riley classes of radio galaxies
FREYA: Fission Reaction Event Yield Algorithm
FRIB: Facility for Rare Isotope Beam at Michigan State
FRITIOF/FTF: Monte Carlo program(s) implementing Lund string dynamics, apparently not an acronym
FRG: Functional renormalization group
FRGE: Functional renormalization group equation
FROG: Fast and Realistic OpenGL event display
FRS: Freyhult, Rej and Staudacher
FRW: Friedmann, Robertson and Walker
FSC: Forward Shower Counter
FSI: Final state interactions
FSR: Final state radiation
FSRQ: Flat-spectrum radio quasar
FZ: Ferrara and Zumino

G

G2HDM: Gauged Two-Higgs-Doublet Model
GAM: Geodesic acoustic mode
GAMBIT: Global And Modular Beyond-the-standard-model Inference Tool
GammeV: Fermilab experiment searching for gamma to milli-eV particle transition
GAMS: Hodoscopic Automatic Multiphoton Spectrometer (in Russian)
GAN: Generative Adversarial (neural) Networks
GANIL: Grand Accélérateur National dIons Lourds
GAP: Groups, Algorithms, Programming code for computational discrete algebra
GAPP: Global Analysis of Particle Properties
GAPS: General Antiparticle Spectrometer
GARD: General Accelerator Research and Development
GARM: Generalized atmospheric Rosenbluth method
GB: Gunion and Bertsch
GBM: Gamma-ray Burst Monitor, part of Fermi/GLAST
GBW: Golec-Biernat and Wüsthoff
GCG: Generalized Chaplygin gas
GCM: Generator coordinate method
GCR: Generalized conjugate residual algorithm
GCRF: Global Challenges Research Fund of UKRI
GDA: Generalized distribution amplitude
GDE: Global Design Effort of the ILC
GDH: Gerasimov, Drell and Hearn
GDR: GPUDirect RDMA
GEANT: GEometry ANd Tracking toolkit for simulating of the passage of particles through matter using Monte Carlo methods
GEMMA: Germanium Experiment for measurement of Magnetic Moment of Antineutrino at the Kalinin Nuclear Power Plant
GEMS: Gravity and Extreme Magnetism (proposed NASA mission)
GENEVA: A Monte Carlo combining higher-order resummations with higher fixed-order calculations, apparently not an acronym
GENIE: Generates Events for Neutrino Interaction Experiments
GENXICC: A Generator for Hadronic Production of Double Heavy Baryons Xi_{cc}
GERDA: GERmanium Detector Array at Gran Sasso
GERT: General Employee Radiological Training
GeVin: GeV inert fermion
GEVP: Generalized eigenvalue problem
Gfitter: A Generic Fitter Project for HEP Model Testing
GGA: Generalized gradient approximation
GGM: Generalized Gauge Mediation
GGRESRC: e+e- event generator, acronym unknown
GGT: Gluon-gluino tree
GHZ: Greenberger--Horne--Zeilinger state in quantum information theory
GiBUU: Giessen Boltzmann--Uehling--Uhlenbeck transport model project
GIM: Glashow, Iliopoulos and Maiani
GIMP: Gravitationally Interacting Massive Particle
GINGER: Gyroscopes IN GEneral Relativity
GiNaC: GiNaC is Not a CAS (Computer Algebra System)
GKP: Gubser, Klebanov and Polyakov rotating string
GKPY: Garcia-Martin, Kaminski, Palaez and Yndurain
GL: General Linear group
GL: Global and local electromagnetic simulation
GLACIER: Giant Liquid Argon Charge Imaging ExpeRiment
GLAST: Fermi Gamma-ray Large Area Space Telescope
GLE: Generalized Langevin equation
GLMM: Gotsman, Levin, Maor and Miller
GLoBES: General Long Baseline Experiment Simulator
GLR-MQ: Gribov, Levin, Ryskin, Mueller and Qiu
GLV: Gyulassy, Levai and Vitev
GLW: de Groot, van Leeuwen and van Weert energy--momentum and spin tensors
GM-VFN: General-mass variable-flavor-number
GMO: Goldberger, Miyazawa and Oehme
GMOR: Gell-Mann, Oakes and Renner
GMRES: Generalized minimal residual algorithm
GMRES-DR: Generalized minimal residual algorithm deflated restarted
GMRESR: Generalized minimal residual recursive algorithm
GmSUGRA: Generalized Minimal Supergravity model
GMSB: Gauge-mediated supersymmetry breaking
GNMSSM: The most general form of the NMSSM
GNO: Goddard, Nuyts and Olive magnetic charge
GNSS: Global Navigation Satellite System
GOE: Gaussian orthogonal ensemble
GOLEM: General One Loop Evaluator for Matrix elements
GoSam: Package that bundles GOLEM and SAMURAI among others
GPD: Generalized parton distribution
GPFS: IBM General Parallel File System
GPhyS: Gravitation and Fundamental Physics in Space
GPI: Global Address Space Programming Interface
GPPZ: Girardello, Petrini, Porrati and Zaffaroni
GRAAL: GRenoble Anneau Accelerateur Laser
GRACE: Gravity Recovery and Climate Experiment
GRACE: Event generator, apparently not an acronym
GRAIL: Gravity Recovery and Interior Laboratory NASA mission
GRAMS: Gamma-Ray and AntiMatter Survey proposal
GRAND: Giant Radio Array for Neutrino Detection
GRANIT: Gravitational Neutron Induced Transitions spectrometer
GRAPES: Gamma Ray Astronomy PeV EnergieS muon telescope in Tamil Nadu
GRAVITY: Interferometric instrument for ESO's VLTI, acronym unknown
GR@PPA: Grace at Proton-Proton/Antiproton event generator based on GRACE
GRB: Gamma-ray burst
GRS: Gamma Ray Spectrometer aboard the Solar Maximum Mission
GRS: Gregory, Rubakov and Sibiryakov
GS: Gaunt and Stirling
GS: Green and Schwarz superstring
GSE: Gaussian symplectic ensemble
GSI: Gesellschaft für Schwerionenforschung (Center for Heavy Ion Research)
GSM: Generic small quark mass regime of chiPT
GSO: Gliozzi, Scherk and Olive
GSR: Generalized slow-roll formalism
GTC: NVIDIA GPU Technology Conference
GUE: Gaussian unitary ensemble
GVD: Gigaton Volume Detector in Lake Baikal
GW: Gravitational wave
GWAS: Genome-wide association study
GZ: Gribov and Zwanziger
GZK: Greisen, Zatsepin and Kuzmin

H

HA-PACS: Highly Accelerated Parallel Advanced system for Computational Sciences in Tsukuba
HADES: High Acceptance Di-Electron Spectrometer experiment at FAIR
HAL QCD: Hadrons to Atomic nuclei from Lattice QCD Collaboration
HALO: Helium And Lead Observatory at SNO
HAPPEX: Hall A Precision Parity EXperiment at JLab
HARDPING: HARD Probe INteraction Generator Monte Carlo event generator
HARP: Hadron Production experiment at CERN
HARPS: High Accuracy Radial Velocity Planet Searcher spectrograph at La Silla
HATCH: Holography: Applications to Technicolor, Condensed matter and Hadrons
HATHOR: HAdronic Top and Heavy quarks crOss section calculatoR
HAWC: High-Altitude Water Cherenkov observatory in Mexico
HAWK: A Monte Carlo generator for the production of Higgs bosons Attached to WeaK bosons at hadron colliders
HAYSTAC: Haloscope At Yale Sensitive To Axion CDM
HB: Horizontal Branch (classification of stars near Main Line)
HBL: High-frequency-peaked BL Lacertae objects
HBT: R. Hanbury Brown and R. Twiss
HDF: Hierarchical Data Format
HDL: Hard density loop
HEAO: High Energy Astronomy Observatory
HEAT: High Energy Antimatter Telescope
HECOLS: High Energies, Compact Objects, and Large Surveys Polish--French lab
HEdSA: Higher Education Service Area of the IMA
HEFTY: DOE Topical Collaboration on HEavy-Flavor TheorY for QCD Matter
HEGET: HELAS Evaluation with GPU Enhanced Technology
HEIDI: extension of the standard model with a "higher dimensional" scalar singlet field
HEIF: Higher Education Innovation Funding in the UK
HELAC: A package to compute electroweak helicity amplitudes
HELAS: Helicity Amplitude Subroutines
HEPAP: High Energy Physics Advisory Panel
HEPGEN: Hard Exclusive Production GENerator for leptoproduction at COMPASS
HERA: Hadron Elektron Ring Anlage at DESY
HERA: Hydrogen Epoch of Reionization Array interferometer
HERD: High Energy cosmic-Radiation Detection facility proposed for a future Chinese space station
HERMES: High-Energy Radiation Megavolt Electron Source at Sandia National Lab
HERMES: DESY fixed-target experiment to explore spin, apparently not an acronym
HERWIG: Hadron Emission Reactions With Interfering Gluons parton shower generator
HERWIRI: High Energy Radiation with Infrared Improvements parton shower generator
HESE: High-energy starting events in neutrino telescopes like IceCube
HESR: High Energy Storage Ring collider at FAIR
HESS: High Energy Stereoscopic System
HFAG: Heavy Flavor Averaging Group
HFET: Heterojunction field effect transistor
HFI: High frequency instrument
HFIR: High Flux Isotope Reactor at ORNL
HFS: Hyperfine splitting or hyperfine structure
HH: Herbig and Haro object in jets from star formation
HHchiPT: Heavy hadron chiral perturbation theory
HHIAF: High-intensity Heavy-Ion Accelerator Facility (formerly Heavy-Ion Advanced research Facility, HIAF?) under construction in Huizhou
HI: Astronomical zone in which hydrogen is mostly atomic
HIC: Helmholtz International Center for FAIR
HIE-ISOLDE: High Intensity and Energy upgrade of ISOLDE
HIGS: High-Intensity Gamma-ray Source at DFELL
HIJING: Heavy Ion Jet INteraction Generator
HILAS: High Intensity Large Acceptance Spectometer proposed for Jlab
HIP: Heterogeneous-compute Interface for Portability for GPU programming
HiPER: High Power laser Energy Research
HIRAX: Hydrogen Intensity and Real-time Analysis eXperiment telescope array in South Africa
HIRES: High Resolution Echelle Spectrometer at the Keck observatory in Hawaii
HiRes-MIA: Hybrid detector consisting of the High Resolution Fly's Eye prototype and the MIchigan muon Array in Utah
HiSCORE: Hundred Square-km Cosmic ORigin Explorer
HISKP: Helmholtz-Institut für Strahlen- und Kernphysik (Helmholtz Institute for Radiation and Nuclear Physics)
HISZ: Hagiwara, Ishihara, Szalapski and Zeppenfeld EW EFT basis
HKN: Hirai, Kumano and Nagai nuclear parton distribution functions
HL: Heavy-light, factorization used in neutrino oscillation studies
HLRF: High-level radio frequency
HLS: Hidden local symmetry
HM: High-mass
HMChPT: Heavy Meson Chiral Perturbation Theory
HMM: Hidden Markov Model
HOBET: Harmonic-Oscillator-Based Effective Theory
HOMFLY-PT: Hoste, Ocneanu, Millett, Freyd, Lickorish, Yetter, Przytycki and Traczyk
HORACE: Higher Order RAdiative CorrEctions event generator
HPCC: High Performance Computing and Communications
HPL: Harmonic polylogarithms
HPQCD: High-precision QCD collaboration
HPS: Heavy Photon Search experiment at JLab
HQE: Heavy quark expansion
HQET: Heavy quark effective theory
HQL: Heavy Quarks and Leptons conference
HQSS: Heavy quark spin symmetry
HPGe: High-purity germanium
HRG: Hadron resonance gas
HRS: High Resolution Separator at ISOLDE
HSA: Heterogeneous Systems Architecture
HSC: Hadron Spectrum Collaboration
HSC: Subaru Hyper Suprime-Cam
HSS: Harmonic superspace
HST: Hubble Space Telescope
HT: Higher twist
HTL: Hard thermal loop
HTLpt: Hard thermal loop perturbation theory
HUNTER: Heavy Unseen Neutrinos from Total Energy-momentum Reconstruction experiment at UCLA
HVeV: High-voltage CDMS detector, possibly pushing for eV-scale energy resolution
HVP: Hadronic Vacuum Polarisation
HXMT: Hard X-ray Modulation Telescope, also known as Insight
HYDJET: HYDrodynamics plus JETs heavy ion event generator

I

IAA: Impact Acceleration Account
IACT: Imaging Atmospheric Cherenkov Telescope
IAM: Inverse Amplitude Method for unitarization
IARD: International Association for Relativistic Dynamics
IARPA: Intelligence Advanced Research Projects Activity
IASD: Imaginary anti-self-dual
IAU: International Astronomical Union
IAXO: International Axion Observatory proposed at CERN
iBF: Impact-parameter beam function
IB: Isospin breaking
IBSHEPP: Iternational Baldin Seminar on High-Energy Physics Problems
IBIS: Imager on Board the INTEGRAL Satellite
IBL: Intergalactic background light
IBP: Integration by parts
IC: Inverse-Compton
ICAL: Magnetized Iron CALorimeter detector under construction for INO
ICAM: Institute for Complex Adaptive Matter
ICAP: International Conference on Atomic Physics
ICARUS: Imaging Cosmic And Rare Underground Signals, originally at Gran Sasso then moved to Fermilab
ICATPP: International Conference on Advanced Technology and Particle Physics
ICCA: International Conference on Clifford Algebras
ICCING: Initial Conserved Charges in Nuclear Geometry model
ICCS: International Conference on Computational Science
IceCube: Neutrino observatory in Antarctica, not an acronym but sometimes treated as such
ICERM: Institute for Computational and Experimental Research in Mathematics at Brown
ICF: Inertial confinement fusion
ICFA: International Committee for Future Accelerators
ICFO: Instituto de Ciencias Fotónicas (Institute of Photonic Sciences) in Barcelona
ICG: Institute of Cosmology and Gravitation
ICGAC: International Conference on Gravitation, Astrophysics and Cosmology
ICGC: International Conference on Gravitation and Cosmology
ICHEC: Irish Centre for High-End Computing
ICISE: International Centre for Interdisciplinary Science Education in Quy Nhon
ICM: International Conference on Magnetism
ICNAAM: International Conference of Numerical Analysis and Applied Mathematics
ICRC: International Cosmic Ray Conference
ICT: Information and communications technology
ICURe: Innovation to Commercialisation of University Research program of Innovate UK
iDM: Inelastic dark matter
IDM: Inert doublet model
IDM: Interacting dark matter
iDMRG: Infinite density matrix renormalization group tensor network method
IDPASC: International Doctorate Network in Particle Physics, Astrophysics and Cosmology in Portugal and Spain
IDS-NF: International Design Study of the Neutrino Factory
iEBE-VISHNU: Integrated(?) Event-By-Event Viscous Israel Stewart Hydrodynamics aNd UrQMD
IEEE: Institute of Electrical and Electronics Engineers
IERC: Integrated Engineering Research Center at Fermilab
IETF: UK Industrial Energy Transformation Fund
IFAE: Incontri di Fisica di Alta Energia
IFIC: Instituto de Física Corpuscular
IGCAC: International Conference on Gravitation, Astrophysics and Cosmology
IGRB: Isotropic diffuse gamma-ray background
IHEP: Institute for High Energy Physics at Protvino, Russia
iHixs: Inclusive Higgs boson cross section program
IIASA: International Institute for Applied Systems Analysis
IIRC: Ito International Research Center in Tokyo
IKAROS: Interplanetary Kite-craft Accelerated by Radiation Of the Sun spacecraft
IKKT: Ishibashi, Kawai, Kitazawa and Tsuchiya
ILC: International Linear Collider
ILD: International Large Detector proposed for the ILC
ILGTI: Indian Lattice Gauge Theory Initiative
ILL: Institut Laue-Langevin
IMA: Institute of Mathematics and its Applications
IMB: Irvine, Michigan and Brookhaven neutrino detector
IMP: Institute of Modern Physics in China
IN2P3: Institut national de physique nucléaire et de physique des particules
INDIGO: Indian Initiative in Gravitational-wave Observations
INFIERI: INtelligent Signal Processing for FrontIEr Research and Industry
INFN: Istituto Nazionale di Fisica Nucleare
INLN: Institut Non Linéaire de Nice
INO: India-based Neutrino Observatory
INPOP: Intégration Numérique Planétaire de lObservatoire de Paris
INS: Institute for Nuclear Studies at The George Washington University
INTEGRAL: International Gamma-Ray Astrophysics Laboratory
IOC: Input Output Controller for EPICS
IOSH: Institution of Occupational Safety and Health
IOTA: Integrable Optics Test Accelerator at Fermilab
IP: Impact parameter, used in heavy-ion collision contexts
IP-Glasma: Impact-Parameter-dependent Glasma model
IP-Sat: Impact-Parameter-dependent Saturation
IPA: Interplay of Particle and Astroparticle Physics workshop
IPAC: International Particle Accelerator Conference
IPDPS: International Parallel and Distributed Processing Symposium
iPEPS: Infinite projected entangled pair states tensor network method
IPN: InterPlanetary Network of satellites
IPPOG: International Particle Physics Outreach Group
IPTA: International Pulsar Timing Array
IRAS: Irfra-Red Astronomical Satellite
IRC: Infrared and collinear
IRIS: Infrastructure for Research and Innovation for STFC
IRMA: Institut de Recherche Mathématique Avancée associated with CNRS
IS: Interstellar cosmic ray fluxes
ISAC: Isotope Separator and ACcelerator facility at TRIUMF
ISAPP: International School on AstroParticle Physics
ISARIC: International Severe Acute Respiratory and Emerging Infection Consortium
ISARIC4C: ISARIC Coronavirus Clinical Characterisation Consortium
ISC: International Supercomputing Conference
ISCO: Innermost stable circular orbit
ISD: Imaginary self dual
iSF: Inverse soft function
ISGW: Isgur, Scora, Grinstein and Wise
ISM: Interstellar Medium
ISNET: Information and Statistics in Nuclear Experiment and Theory
ISW: Integrated Sachs--Wolfe effect from cosmic string
IsoDAR: Isotope Decay-At-Rest electron anti-neutrino source for BSM searches
ISOLDE: Isotope mass Separator On-Line facility at CERN
ISPE: Initial single pion emission
ISPF: International Science Partnerships Fund in the UK
ISR: Initial-state radiation
ISR: Intersecting Storage Rings
ISS: Intriligator, Seiberg and Shih
ISS: Inverse Seesaw model
ISSO: Information System Security Officer
ISSYP: International Summer School for Young Physicists at Perimeter
ISVHECRI: International Symposium on Very High Energy Cosmic Ray Interactions
iTEBD: Infinite time-evolving block decimation tensor network method
ITEP: Institute for Theoretical and Experimental Physics in Moscow
ITIY: Intriligator, Thomas, Izawa and Yanagida models of dynamical supersymmetry breaking
ITMD: Improved Transverse Momentum Dependent factorization
ITNA: Individual Training Needs Assessment at Fermilab
IWNT: International Workshop on Nuclear Theory
IXO: International X-ray Observatory
IZEST: International Center for Zetta- Exawatt Science and Technology in Paris
IZMIRAN: Institute of Earth magnetism, ionosphere and radiowaves propagation named after Nikolay Pushkov of the Russian Academy of Sciences (Institut zemnogo magnetizma, ionosfery i rasprostraneniya radiovoln im. N. V. Pushkova Rossiyskoy Akademii nauk)

J

J-PARC: Japan Proton Accelerator Research Complex
JADE: Japan, Deutschland, and England detector at DESY's PETRA, also refers to type of jet algorithm developed by this collaboration
JADE: Joint Academic Data-science Endeavour in the UK
JAGS: Just Another Gibbs Sampler bayesian analysis code
JAM: Jet A--A Microscopic transport model
JAXA: Japan Aerospace Exploration Agency
JDEM: Joint Dark Energy Mission
JEDI: Jülich Electric Dipole moment Investigations collaboration
JEM-EUSO: Japan Experiment Modules Extreme Universe Space Observatory
JEWEL: Jet Evolution With Energy Loss event generator
JET: Topical collaboration on Jet and Electromagnetic Tomography of extreme phases of matter in heavy-ion collisions
JETSCAPE: Jet Energy-loss Tomography with a Statistically and Computationally Advanced Program Envelope
JGRG: General Relativity and Gravitation in Japan
JHF: Japan Hadron Facility
JIMWLK: Jalilian-Marian, Iancu, McLerran, Weigert, Leonidov and Kovner
JINR: Joint Institute for Nuclear Research in Dubna, Russia
JISC: Joint Information Systems Committee
JLA: Joint Light-curve Analysis of SDSS and SNLS supernova data
JNIPER: Joint Network for Informal Physics Education and Research
JPAC: Joint Physics Analysis Center set up by Indiana and JLab
JS: Jacobsen and Saleur
JSNS2: J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source
JSPS: Japan Society for the Promotion of Science
JTFI: Joint Task Force Initiative at Fermilab
JUNIPR: Jets from UNsupervised Interpretable PRobabilistic models framework
JUNO: Jiangmen Underground Neutrino Observatory, formerly Daya Bay
JVAS: Jodrell/Very Large Array Astrometric Survey
JWST: James Webb Space Telescope
JYFL: Jyväskylä Department of Physics (Fysiikan Laitos)

K

K2K: KEK to Super-Kamiokande long-baseline neutrino oscillation experiment
KAGRA: Kamioka Gravitational Wave Detector
KamLAND: Kamioka Liquid Scintillator Anti-Neutrino Detector
KamLAND-ZeN: KamLAND Zero Neutrino double beta decay experiment
KARMEN: Karlsruhe Rutherford interMediate Energy Neutrino experiment
KASCADE: KArlsruhe Shower Core and Array DEtector
KATRIN: KArlsruhe TRItium Neutrino experiment
KCWI: Keck Cosmic Web Imager
KdV: Korteweg and de Vries
KEDR: Detector at VEPP, acronym unknown
KEK: High Energy Accelerator Research Organization (Ko Enerugi Kasokuki Kenkyu Kiko)
KEK-PS: Proton-synchrotron at KEK
keVin: keV inert fermion
KGBJS: Kutak, Golec-Biernat, Jadach and Skrzypek evolution equation
KIC: Kepler Input Catalog of stars
KiDS: Kilo-Degree Survey using the VST at ESO
KIMS: Korea Invisible Mass Search dark matter experiment
KK: Kaluza and Klein
KK: Event generator apparently superseding both KORALB and KORALZ, which are apparently not acronyms
KKLT: Kachru, Kallosh, Linde, and Trivedi
KKMC: Monte Carlo event generator written in Krakow and Knoxville during year 2K-1
KL: Kallen and Lehmann
KL: K-Long facility proposed at JLab
KLASH: KLoe magnet for Axion SearcH proposed experiment at Frascati
KLN: Kharzeev, Levin and Nardi model for pre-equilibrium phase
KLN: Kinoshita, Lee and Nauenberg cancellations of IR-divergent Feynman diagrams
KLOE: K-Long Experiment
KLT: Kawai, Lewellen, and Tye relation between open- and closed-string amplitudes
KLWMIJ: Kovner, Leonidov, Weigert, McLerran, Iancu and Jalilian-Marian, apparently a different limit of JIMWLK
KM3NeT: Cubic Kilometre Neutrino Telescope under construction in the Mediterranean
KMMW: Kruczenski, Mateos, Myers and Winters
KMR: Khoze, Martin and Ryskin
KMR: Kimber, Martin and Ryskin parton distribution formalism
KMS: Kubo, Martin and Schwinger
KNC: Knights Corner co-processor
KNO: Koba, Nielsen and Olesen
KNP: Kim, Nilles and Peloso axion inflation model
KO: Kugo and Ojima
KoMPoST/K0MP0ST/KMPST: Linear kinetic theory code by Kurkela, Mazeliauskas, Paquet, Schlichting and Teaney
KoRIA: Korea Rare Iostope Accelerator
KOTO: K0 at TOkai experiment
KP: Kadomtsev and Petviashvili
KPI: Key performance indicator.
KPP: Kolmogorov, Petrovsky and Piskunov partial differential equation
KPZ: Kardar, Parisi and Zhang equation
KREEP: Potassium, rare-earth element and phosphorus component of some lunar rocks
KRKMC: NLO Monte Carlo program, acronym unknown, may have something to do with re-inserting LO kernels.
KS: Klebanov and Strassler
KSRF: Kawarabayashi, Suzuki, Riazuddin and Fayyazudin
KSS: Kovtun, Son and Starinets
KSVZ: Kim, Shifman, Vainshtein and Zakharov
KSW: Kaplan, Savage and Wise
KT: Kennedy and Thorndike
KTeV: Kaons at the Tevatron
KTY: Kimura, Takamura and Yokomakura
KvBLL: Kraan, van Baal, Lee and Lu calorons

L

L3: Detector at LEP, apparently not an acronym
LAB: Linear alkylbenzene
LAC: Large Application Compile node
LAFEX: High Energy Physics Laboratory of the Universidade do Estado do Rio de Janeiro
LAGEOS: Laser Geodynamics Satellites
LAGO: Latin American Giant Observatory
LAGUNA: Large Apparatus studying Grand Unification and Neutrino Astrophysics
LaMET: Large-Momentum Effective field Theory
LANL: Los Alamos National Lab
LANSCE: Los Alamos Neutron Science Center
LapH: Laplacian Heaviside smearing
LAPW: Linearized augmented plane wave
LARP: LHC Accelerator Research Program
LArIAT: Liquid Argon In A Testbeam neutrino experiment at Fermilab
LArTPC: Liquid Argon Time Projection Chambers
LASAGNA: Lepton Asymmetric Sterile--Active momentum-Grid Neutrino Analyser adaptive ODE solver
LASS: Large Acceptance Solenoid Spectrometer at SLAC
LAT: Large Area Telescope
LBNE: Long Baseline Neutrino Experiment
LBNF: Long-Baseline Neutrino Facility
LBNO: Long Baseline Neutrino Observatory
LBT: Linear Boltzmann Transport model and corresponding event generator
LCC: Linear Collider Collaboration
LCD: Linear Collider Detector project at CERN
LCE: Large cut-off effects regime of chiPT
LCG: Light cone gauge
LCLS: Linac Coherent Light Source at SLAC
LCQ: Light cone quantization
LCWF: Light-cone wave function
LDA: Local density approximation
LDAP: Lightweight Directory Access Protocol
LDM: Light dark matter
LDME: Long-distance matrix element
LDMX: Light Dark Matter eXperiment proposed at SLAC
LDRD: Laboratory Directed Research and Development at Livermore
LEAR: Low Energy Antiproton Ring at CERN
LEBC: LExan Bubble Chamber at CERN
LeCosPA: Leung Center for Cosmology and Particle Astrophysics
LEDA: Library of Efficient Data types and Algorithms
LEGEND: Large Enriched Germanium Experiment for Neutrinoless ββ Decay and Gran Sasso
LENA: Low Energy Neutrino Astronomy liquid scintillator
LEPS: Laser Electron Photon Experiment at SPring-8
LESA: Lepton-number Emission Self-sustained Asymmetry [dipole neutrino minus antineutrino]
LETI: Laboratoire d'électronique des technologies de l'information of CEA
LFD: Light-front dynamics
LFI: Low frequency instrument
LFQM: Light front quark model
LFV: Lepton flavor violation
LHAASO: Large High Altitude Air Shower Observatory planned for Yangbajing, Tibet
LHAPDF: Les Houches Accord Parton Density Functions
LHCC: Large Hadron Collider Committee
LHCO: Standardized detector simulator output format
LHCHXSWG: Large Hadron Collider Higgs Cross Section Working Group
LHeC: Large Hadron-electron Collider
LHEF: Les Houches Event File format
LHPC: Lattice Hadron Physics Collaboration
LHT: Littlest Higgs model with T-parity
Li_n: Polylogarithm
LIFE: Laser Inertial Fusion Energy
LIGO: Laser Interferometer Gravitational Wave Observatory
LILITH: LIght LIkelihood fiT for the Higgs Python tool for constraining new physics from signal strength measurements
LIME: Lattice QCD Interchange Message Encapsulation format
LIPSS: Light Pseudoscalar and Scalar Search
LISA: Laser Interferometer Space Antenna
LISHEP: LAFEX International School on High Energy Physics
LiteBIRD: Lite (Light) satellite for the studies of B-mode polarization and Inflation from cosmic background Radiation Detection
LiteRed: A tool for the Loop InTEgrals REDuction
LKF: Landau, Khalatnikov and Fradkin transformations relating n-point functions in different gauges
LKP: Lightest Kaluza-Klein particle
LLAMA: Large Latin American Millimeter Array radio telescope in Argentina
LLESA: Livermore Laboratory Employee Services Association
LLNS: Lawrence Livermore National Security, LLC
LLR: Langfeld, Lucini and Rago
LLRF: Low-level radio frequency
LLVM: Compiler infrastructure project formerly named Low Level Virtual Machine
LMA: Large mixing angle solution of the solar neutrino problem
LMC: Large Magellanic Cloud
LME: Large mass expansion
LMP: Lu, Mei and Pope
LMXB: Low-mass X-ray binary
LNF: Laboratori Nazionali di Frascati, INFN
LNGS: Laboratori Nazionali del Gran Sasso
LNV: Lepton number violation
LOFAR: Low-Frequency Array interferometer
LOOL: Leading-order one-loop
LOFF: Larkin, Ovchinnikov, Fulde and Ferrel
LORRI: LOng-Range Reconnaissance Imager on the New Horizons mission to Pluto
LOSP: Lightest Ordinary Supersymmetric Particle
LPM: Landau, Pomeranchuk and Migdal
LPSC: Laboratoire de Physique Subatomique et de Cosmologie de Grenoble
LQC: Loop Quantum Cosmology
LOFT: Large Observatory For X-ray Timing proposed ESA mission
LQG: Loop Quantum Gravity
LRG: Luminous red galaxies
LRTH: Left--right twin Higgs model
LRZ: Leibniz-Rechenzentrum near Munich
LSB: Low Surface Brightness
LSCO: Lanthanum copper oxide
LSDS: Lead Slowing Down Spectrometer at LANL
LSF: Light-quark spin--flavor symmetry
LSND: Liquid Scintillator Neutrino Detector at the Los Alamos Meson Physics Facility
LSP: Lightest supersymmetric particle
LSS: Large-scale structure
LSST: Large Synoptic Survey Telescope
LSZ: Lehmann, Symanzik and Zimmermann
LTB: Lemaître, Tolman and Bondi
LTD: Loop--tree duality
LTI: Learning Tools Interoperability in Canvas
LUCIAE: Hadron and string cascade model, acronym meaning unknown
LUPM: Laboratoire Univers et Particules de Montpellier
LUX: Large Underground Xenon dark matter experiment
LVD: Large Volume Detector neutrino experiment at Gran Sasso
LVS: Large volume scenario
LXCDM: Cold dark matter model with variable cosmological term Lambda and dynamical cosmon X
LZ: LUX-ZEPLIN

M

MACRO: Monopole, Astrophysics and Cosmic Ray Observatory
MADMAX: MAgnetized Disc and Mirror Axion eXperiment dielectric haloscope
MAGIC: Major Atmospheric Gamma Ray Imaging Cherenkov telescope
MAGIC: Mathematics Access Grid Instruction and Collaboration project
MagICAL: Magnetized Iron CALorimeter detector under construction for INO
MAGIS: Mid-band Atomic Gravitational-wave Interferometric Sensor
MAID: Mainz Analysis Interactive Dial-in
MALBEK: Majorana Low-background BEGe detector at Kimballton
MAMI: Mainz Microtron
mAMSB: Minimal anomaly-mediated supersymmetry breaking model
MAOS: M_T2-Assisted On-Shell momentum
MAP: Muon Accelerator Program
MAPT: Massless Analytic Perturbation Theory
MARTINI: Modular Algorithm for Relativistic Treatment of heavy IoN Interactions
MATHUSLA: MAssive Timing Hodoscope for Ultra Stable neutraL pArticles proposed surface detector at CERN
MATTER: Modular All-Twist Transverse and Elastic scattering induced Radiation event generator
MaVaN: Mass-varying neutrino
MAXI: Monitor of All-sky X-ray Image experiment on the International Space Station
MAXIMA: Millimeter Anisotropy eXperiment IMaging Array balloon-borne CMB telescope
MBR: Minimum Bias Rockefeller model of cross sections
MCC: Machine Control Center at JLab
MCFL: Magnetic-color-flavor-locked phase
MCFM: Monte Carlo for FeMtobarn processes
MCPMFV: Maximally CP- and Minimally Flavour-Violating
MCT: Contransverse mass kinematic variable
MCT2: Constransverse mass kinematic variable
MCPM: Maximally CP-symmetric two-Higgs-doublet Model
MDI: Momentum-dependent interaction
MDM: Matrix decomposition method
MDM: Michigan, Dartmouth and MIT observatory on Kitt Peak
MDS: Metadata Server in Lustre system
ME: Matrix element
MEC: Meson-exchange current
MEG: Mu to E Gamma experiment at PSI
MEGA: Mu to E GAmma experiment at Los Alamos
MEGa-ray: Mono-energetic gamma-ray at Livermore
MEIC: Medium-energy Electron--Ion Collider under consideration for Jlab or Brookhaven
MEKS: Modified Ellis, Kunszt and Soper code?
MELA: Matrix Element Likelihood Analysis
MEM: Matrix element method
MEM: Maximum entropy method
MEMO: Metastable exotic multi-hypernuclear object
MENLOPS: Matrix Element plus Next-to-Leading Order Parton Shower
MEPHI: Moscow Engineering Physics Institute
MEPS: Matrix Element plus Parton Shower
MERA: Multi-scale Entanglement Renormalization Ansatz
MERLIN: Multi-Element Radio Linked Interferometer Network
MESA: Mainz Energy Recovery Superconducting Accelerator
MESA: Modules for Experiments in Stellar Astrophysics stellar evolution code
MESE: Medium Energy Starting Events at IceCube
MEtop: Single-top production generator, acronym unknown
MFV: Minimal flavor violation
MFT: Mean field theory
mGMSB: Minimal gauge-mediated supersymmetry breaking
MGS: Mars Global Surveyor
MHV: Maximal helicity violation
MIAN: Steklov Mathematical Institute of the Russian Academy of Sciences (Matematicheskiy Institut Akademiya Nauk)
MIAPP: Munich Institute for Astro- and Particle Physics
MIB: Minimal integrity basis for polynomials of order parameters
MIC: Multiprogrammatic and Institutional Computing at Livermore
MICE: Muon Ionization Cooling Experiment
MicrOMEGAs: Program for calculating dark matter properties (including the relic density Omega h^2), apparently not an acronym
MICROSCOPE: MICRO-Satellite à traînée Compensée pour l'Observation du Principe d'Equivalence
MiDM: Magnetic inelastic Dark Matter
MIKE: Magellan Inamori Kyocera Echelle spectrograph
Milagro: Gamma-ray observatory, Spanish for "miracle", not an acronym but sometimes treated as such
MIMAC: MIcro TPC MAtrix of time projection Chambers for dark matter directional detection
MIND: Magnetized Iron Neutrino Detector
MINERVA: Main Injector Experiment for nu--A at Fermilab
MiNLO: Multi-scale improved next-to-leading order method
MINOS: Main Injector Neutrino Oscillation Search
MINSIS: Main Injector Non-Standard Interaction Search
MIPP: Main Injector Particle Production experiment at Fermilab
MIRO: Microwave-Induced Resistance Oscillations
MISC: Maskawa Institute for Science and Culture at Kyoto Sangyo University
MiXDM: Multiple states for inelastic and exciting dark matter
MKL: Intel Math Kernel Library
MLC: Mandelbrot Locally Connected conjecture
MLF: Material and Life Science Experimental Facility at J-PARC
MLM: M. L. Mangano
MLS: Minimal Length Scenario
MMCP: Mathematical Modeling and Computational Physics
MMHT: Martin, Motylinski, Harland-Lang and Thorne parton distributions
MNS: Maki, Nakagawa and Sakata
MO: Muskhelishvili and Omnes
MoEDAL: Monopole and Exotics Detector At the LHC
MOLLER: Moller scattering experiment at Jlab, not an acronym
MOMENT: MuOn-decay MEdium baseline NeuTrino beam experiment
MOND: Modified Newtonian Dynamics
MonteCUBES: Monte Carlo Utility Based Experiment Simulator
MoS2: Molybdenum disulfide
MOS: Metal oxide semiconductor (or silicon) cameras on XMM-Newton
MPD: Multi-Purpose Detector at NICA at JINR
MPG: Max Planck Gesellschaft (society)
MPI: Message Passing Interface
MPI: Multiple parton interactions
MPQ: Max-Planck-Institut für Quantenoptik
MPS: Matrix product states
MPS: Multiparticle spectrometer at Fermilab in the 1980s
MPT: Modified perturbation theory
mQ: Millicharged particles (and a proposed search for them in hep-ex/9804008)
MRI: Major Research Instrumentation program of the NSF
MRPC: Multigap Resistive Plate Chamber
MRAM: Magnetoresistive random access memory, or magnetic random access memory
MRS: Materials Research Society
MRSSM: Minimal R-symmetric supersymmetric standard model
MRST: A. D. Martin, R. G. Roberts, W. J. Stirling, and R. S. Thorne
MRW: Martin, Ryskin and Watt parton distribution formalism
MS: Magueijo and Smolin
MSbar: Modified Minimal Subtraction
MSR: Renormalization scheme claimed to be the simplest extension of MSbar to renormalization scales R << m_Q
MSSM: Minimal supersymmetric standard model
MSSU(5): Minimal supersymmetric SU(5) model
MST: Madison Symmetric Torus
MSTW: A. D. Martin, W. J. Stirling, R. S. Thorne, and G. Watt
mSUGRA: Minimal supergravity
MSW: Mikheev, Smirnov, and Wolfenstein
MT: Mathematica package to compute convolutions based on Mellin transforms
MT2: Stransverse mass kinematic variable (similar to transverse mass)
MTV: NNSA Consortium for Monitoring, Technology, and Verification
mu distortion of the CMB represents deviations from ideal black body radiation due to imperfect thermalization of energy dissipated from density fluctuations, which can be treated as an effective chemical potential
MUC: Munich airport code, applied to nearby supercomputer
muDAR: muon Decay At Rest
MUED: Minimal Universal Extra Dimension model
Mueller--Navelet jets are characterized by high p_T and large rapidity separation
MuLan: Muon Lifetime Analysis experiment at PSI
MUNU: Experiment measuring the neutrino magnetic moment
munuSSM: "mu from nu" supersymmetric standard model, in which the mu problem is solved by introducing right-handed neutrinos
MuPs: Muonium-positronium (mu+ e- e- e+)
MURMUR: Low-noise neutron-passing-through-walls experiment, acronym unknown but potentially related to the University of Namur
MUSE: Multi Unit Spectroscopic Explorer for ESO's VLT
MUSIC: MUSCL for Ion Collisions program
MUSCL: Monotone Upstream-centered Schemes for Conservation Laws
MUST: Tool to detect MPI usage errors, apparently not an acronym
MVA: Multi-variate analysis

N

N2HDM: Next-to-Two-Higgs-Doublet Model with a real singlet in addition to the second doublet
NAdS: Nearly anti-de Sitter
NAHE: Nanopoulos, Antoniadis, Hagelin and Ellis
NaI(Tl): Sodium iodide doped with thallium
NAMD: Not (just) Another Molecular Dynamics program
NANOGrav: North American Nanohertz Observatory for Gravitational Waves pulsar timing array
NBS: Nambu, Bethe and Salpeter
NCCP: Non-compact complex projective model in SU(N)/U(N-1)
NCEL: Neutral-current elastic cross section
NCh: Non-uniform chiral phase
NCQ: Number of constituent quarks
NCRM: UK National Centre for Research Methods
NCSC: UK National Cyber Security Centre
NCSL: National Superconducting Cyclotron Laboratory
nCTEQ: nuclear Coordinated Theoretical--Experimental Project on QCD
NDR: Naive dimensional regularization, with implicit MSbar subtraction
NDS: nHYP Dislocation Suppressing action
NEC: Null energy condition
NEFT: Nuclear effective field theory
NEMO: Neutrino Ettore Majorana Observatory
NEOS: Neutrino Experiment for Oscillation at Short baseline in Korea
NERSC: National Energy Research Scientific Computing Center
NESSiE: Neutrino Experiment with SpectrometerS in Europe, proposed for CERN and/or Fermilab
NESTA: UK charity, formerly National Endowment for Science, Technology and the Arts
NESTOR: Neutrino Extended Submarine Telescope with Oceanographic Research
NeurIPS: Neural Information Processing Systems conference
NEUT: Neutrino interaction simulation library, apparently not an acronym
NEWSdm: Nuclear Emulsions for WIMP Search---directional measurement
NeXSPheRIO: Hydrodynamics code combining NeXuS and SPheRIO
NEXT: Neutrino Experiment with a Xenon Time projection chamber
NExT: New connections between Experiment and Theory Institute
NeXuS: Hadronic interaction model, apparently replaced by EPOS
NFS: Network File System
NFT: Network File Transport utility at Livermore
NFW: Navarro, Frenk and White
NGC: New General Catalogue of galaxies
NGO: New Gravitational wave Observatory, also known as eLISA
NHDM: N-Higgs-doublet model
NIC: Network Interface Card
NICA: Nuclotron-based Ion Collider fAcility at JINR
NICODEMOS: Numerical Integration with COntour DEformation and MOdular Subtractions
NIF: National Ignition Facility
NISQ: Noisy Intermediate-Scale Quantum technology
NLCWF: Nonstandard light-cone wave function
NLEFT: Nuclear Lattice Effective Field Theory
NLOPS: Next-to-Leading Order Parton Shower
NMC: New Muon Collaboration
NME: Nuclear matrix element
NMFV: Non-minimal flavor violation
NMHV: Next-to-maximal helicity violation
NML: (Former) New Muon Lab at Fermilab
NMR: Nuclear magnetic resonance
NMSGUT: New Minimal Supersymmetric Grand Unified Theory
nNJL: Non-local Nambu and Jona-Lasinio model
NNMSM: Next to new minimal standard model
NNPDF: Collaboration using Neural Networks to calculate Parton Distribution Functions
NNSA: National Nuclear Security Administration
NOAA: National Oceanic and Atmospheric Administration
NOMAD: Neutrino Oscillation MAgnetic Detector at CERN
NORDITA: Nordic Institute for Theoretical Physics, Nordisk Institut for Teoretisk (Atom)fysik in Danish
NOvA: NuMI Off-axis electron-neutrino Appearance experiment
NOW: Neutrino Oscillation Workshop
NPA: Nuclear Physics in Astrophysics
NPDF: Nuclear Parton Distribution Functions
NPDGamma: Neutron--Proton to Deutron--Photon experiment to measure parity-violating asymmetry and pion--nucleon weak coupling
nPI: n-particle irreducible
NPQMSSM: Next-to-minimal supersymmetric standard model forced to solve the strong CP problem
NRAO: National Radio Astronomy Observatory, an NSF facility
NRGR: Non-relativistic general relativity
NRHEP: Numerical Relativity and High Energy Physics
nrMSSU(5): Minimal supersymmetric SU(5) model completed with flavor-dependent nonrenormalizable operators
NS: Neveu and Schwarz
NS: Non-singlet
NSI: Non-standard (neutrino) interaction
NSPT: Numerical Stochastic Perturbation Theory
NSR: Neveu, Schwarz and Ramond
NSSC: NNSA Nuclear Science and Security Consortium
NSUSY: Natural supersymmetry
NSVZ: Novikov, Shifman, Vainshtein and Zakharov
NUGHM: Non-universal gaugino and Higgs mass susy models
NUHM: Non-universal Higgs mass susy models
NUMA: Non-Uniform Memory Access
NuMI: Neutrinos at the Main Injector
nuMSM: Neutrino Minimal Standard Model including three sterile right-handed neutrinos
nuNMSM: Neutrino Next-to-Minimal Standard Model that also adds a scalar singlet
NuPECC: Nuclear Physics European Collaboration Committee
nuPIL: Neutrinos from a PIon beam Line design proposed for DUNE
NuQS: Collaboration acronym unknown but probably related to nuclear quantum simulations
NURT: NUclear and Related Technologies
NuSea: Nucleonic Sea asymmetry measurement experiment
NuSOnG: Neutrino Scattering On Glass
NuSTAR: Nuclear Spectroscopic Telescope Array
NuSTEC: Neutrino Scattering Theory Experiment Collaboration
nuSTORM: Neutrinos from STORed Muons
NUT: Newman, Unti and Tamburino
NuTeV: Neutrinos at the Tevatron
NuWro: Wroclaw Neutrino Event Generator
NVSS: NRAO Very Large Array Sky Survey

O

OAM: Orbital angular momentum
OBEP: One-boson-exchange potential for nuclei
ODA: Official Development Assistance
ODLRO: Off-diagonal long-range order
OGE: One-gluon exchange
OGLE: Optical Gravitational Lensing Experiment
OHe: Dark matter model of a lepton-like doubly charged particle O bound with a primordial helium nucleus
OISSO: Organizational Information System Security Officer
OKA: Experiments with Kaons in Russian
OME: Operator matrix element
OMEG: Origin of Matter and Evolution of Galaxies symposia
O'Mega: Optimizing Matrix Element Generator compiler
OMEGA EP: OMEGA extended performance; OMEGA is a high-power ultraviolet laser, and doesn't seem to be an acronym
OPAL: Omni Purpose Apparatus for LEP
OPE: Operator product expansion
OPERA: Oscillation Project with Emulsion-tRacking Apparatus at LNGS
OPP: Ossola, Papadopoulos and Pittau
OPUCEM: Oblique Parameters Using C with Error-checking Machinery code
ORCA: Oscillation Research with Cosmics in the Abyss proposed neutrino detector
ORCID: Open Researcher and Contributor ID
ORKA: The Golden KAon Decay experiment proposed at Fermilab
ORNL: Oak Ridge National Lab
OSB: Observational Science Board of the Einstein Telescope
OSCAR: Open Standard Codes and Routines
OscSNS: Experiment to search for sterile neutrino oscillations using the Spallation Neutron Source at Oak Ridge
OSQAR: Optical Search of QED vacuum magnetic birefringence, Axion and photon Regeneration experiment at CERN
OSG: Open Science Grid
OSI: Open Systems Interconnection model
OSIRIS-REx: Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer NASA asteroid sample-return mission
OSS: Lustre Object Storage Server
OST: Lustre object storage targets
OSTI: DOE Office of Scientific and Technical Information
OTO: Out-of-time-ordered correlators
OTS: Open Terminal Server
OWL: One Way Link
OWL: OverWhelmingly Large telescope of ESO
OZI: Okubo, Zweig and Iizuka

P

P5: Particle Physics Project Prioritization Panel
PAC: Program Advisory Committee at JLab
PACIAE: partonic and hadronic cascade model, acronym meaning unknown
PACIFIC: Particle Astrophysics and Cosmology Including Fundamental InteraCtions
PACS-CS: Parallel Array Computer System for Computational Sciences
PADME: Positron Annihilation into Dark Matter Experiment at Frascati
PAMELA: Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics
PANDA: antiProton ANnihilations at DArmstadt experiment at FAIR
PandaX: Liquid xenon dark matter experiment in China (CJPL), apparently not an acronym
PANIC: Particles and Nuclei International Conference
PanSTARRS: Panoramic Survey Telescope and Rapid Response System
PArthENoPE: Public Algorithm Evaluating the Nucleosynthesis of Primordial Elements
PARTICLEFACE: COST Action "Unraveling new physics at the LHC through the precision frontier", apparently not an acronym
PASC: Swiss Platform for Advanced Scientific Computing
PASEP: Partially asymmetric simple exclusion process
PAX: Polarized Antiproton eXperiments
PBH: Primordial black hole
PCA: Principal component analysis
PCIe: Peripheral Component Interconnect Express
PDS: Power divergence subtraction scheme
PEARC: Practice and Experience in Advanced Research Computing conference
PEB: Polarized electron beam
PEMD: Power electronics, machines and drives
PEN: Pion to e+nu experiment at PSI
PEP: Positron Electron Project at SLAC
PEPS: Projected entangled pair states tensor network method
PERKEO: Superconducting cold neutron beta-decay spectrometers at ILL, acronym unknown
PETRA: Positron-Electron Tandem Ring Accelerator at DESY
PFH: PAMELA, Fermi and HESS
PFX: Procedures for Researchers document at Fermilab
PGS: Pretty Good Simulation of high energy collisions
PHEGAS: A phase space generator for automatic cross-section computation
PHENIX: Pioneering High Energy Nuclear Interaction eXperiment at RHIC
PhET: Physics Education Technology
PHHQP: Pseudo-Hermitian Hamiltonians in Quantum Physics
PHOBOS: RHIC experiment, not an acronym, but a reference to a moon of Mars
PHOKHARA: Event generator including NLO QED effects, apparently not an acronym
PHSD: Parton-Hadron-String Dynamics transport model
PHY: The physical layer of the OSI model
PhySyHCAl: A Physics System based on Hierarchical Computer Algebra
PIBETA: Pion Beta experiment at PSI
PIC: Physics in Collision
PICASSO: Project in Canada to Search for Supersymmetric Objects, or Projet d'Identification de CAndidats Supersymétriques SOmbres at SNO
PICO: PICASSO + COUPP
PIDM: Planckian Interacting Dark Matter
PiENu: Pion decay experiment at TRIUMF
PINGU: Precision IceCube Next Generation Upgrade
PIP: Proton Improvement Plan at Fermilab
PIXIE: Primordial Inflation Explorer polarimeter
PJFry: Tensor reduction code, acronym unknown
PKS: Parkes observatory in Australia, and the radio catalog it produced
PLaIn LQCD: Lambda Cold Dark Matter with Power-LAw INflation
PLANCK: CMB satellite experiment; not an acronym, though sometimes treated as such
PLC: Photon linear collider
PLQCD: PRACE Lattice QCD library
pMSSM: Phenomenological Minimal Supersymmetric Standard Model
PMNS: Pontecorvo, Maki, Nakagawa and Sakata
PNDME: Precision Neutron Decay Matrix Elements collaboration
PNJL: Polyakov, Nambu and Jona-Lasinio
pNRQCD: Potential nonrelativistic QCD
POEMMA: Probe of Extreme Multi-Messenger Astrophysics NASA mission
PolarBeaR: Polarization of Background Radiation
POLARIS: Petawatt Optical Laser Amplifier for Radiation Intensive Experiments
POT: Protons on target
POWHEG: POsitive Weight Hardest Emission Generator
POWHEG BOX: Automatic implementation of POWHEG for generic NLO processes, apparently not an acronym
PowHel: Framework combining the POWHEG-Box with the HELAC-NLO package
PPAC: Parallel-plate avalanche counter
PPAP: STFC Particle Physics Advisory Panel
PPB: Polar Patrol Balloon
PPC: International Conference on Interconnections between Particle Physics and Cosmology
PPF: Pisano, Pleitez and Frampton
PPM: Piecewise Parabolic Method
PQ: Peccei and Quinn
POLARBEAR: CMB polarization experiment in Chile, apparently not an acronym
PQWW: Peccei, Quinn, Weinberg and Wilczek
PRACE: Partnership for Advanced Computing in Europe
PrimEx: Primakoff Experiment at Jlab
PRISM: Polarized Radiation Imaging and Spectroscopy Mission proposed to ESA
PRISMA: PRecision physics, fundamental Interactions and Structure of MAtter Cluster of Excellence at Mainz
PROPOSAL: PRopagator with Optimal Precision and Optimized Speed for All Leptons code
PROSA: PROton Structure Analyses in hadronic collisions collaboration
PROSPECT: A PRecision Oscillation and SPECTrum Experiment at Oak Ridge
PS: Pure-singlet
PSA: Phase-shift analysis
PSCz: Point Source Catalogue of redshifts from IRAS
PSI: Paul Scherrer Institut
PSL: Projective special linear group
PSLQ: Integer relation algorithm based on a Partial Sum of square implemented with a LQ (lower trapezoidal-orthogonal) matrix factorization
PSR: Pulsating Source of Radio (i.e., a pulsar)
PSRB: Professional, Statutory and Regulatory Bodies
PSRE: Public-Sector Research Establishment
PSXE: Intel Parallel Studio version
PT: Pinch technique
PTOLEMY: Princeton Tritium Observatory for Light, Early-universe, Massive-neutrino Yield
PTX: Parallel Thread Execution assembly-like language
PV: Parity-violating
PV: Principal value, used in regularization schemes
PVA4: Parity Violating Asymmetry experiment in hall 4 at MAMI
PVLAS: Polarizzazione del Vuoto con LASer
PWA: Partial wave analysis
PWMM: Plane Wave Matrix Model
PWNe: Pulsar Wind Nebulae
PyR@TE: Python Renormalization group equations At Two-loop for Everyone
PYTHIA: An event generator named after the Oracle of Delphi

Q

QCD_AS: QCD with quarks in the two-index anti-symmetric representation
QCDF: QCD factorization
QCDM: Quintessence Cold Dark Matter cosmological model
QCDSF: German lattice collaboration, acronym meaning unknown (related to SFB?)
QFEXT: Quantum field theory under the influence of external conditions
QGP: Quark--gluon plasma
QGS or QGSM: Quark--gluon string model
QHD: Quantum haplodynamics
QISM: Quantum Inverse Scattering Method
QJT: Quantum Jet Theory
QKD: Quantum key distribution
QLM: Atos Quantum Learning Machine
QMC: Quark-meson coupling
QMRK: Quasi-multi-Regge kinematics
QNM: Quasinormal mode
QPA: Quasiparticle approximation
QPACE: QCD Parallel Computing on the Cell Broadband Engine
QPE: Quantum phase estimation
QPIC: Quantum Photonics Integrated Circuit
QRPA: Quasiparticle random phase approximation
QSO: Quasi-stellar objects (quasars)
QSSR: QCD spectral sum rules
QTEC: Quantum Technology Enterprise Centre at Bristol
QTIC: Quantum Technologies Innovation Centre at Bristol
QTS: Quantum Theory and Symmetries
QUaD: QUEST at DASI
QuantEmX: Quantum Emergence Exchange
QUASAR: Quantum Systems and advanced Accelerator Research group
QUASAR: Proposed Quasi-Axisymmetric Stellarator Research facility
QUAX: QUaerere AXion ("search axion") proposal
QUBIC: Q and U Bolometric Interferometer for Cosmology observatory in Argentina
QUEST: Q and U Extragalactic Sub-mm Telescope
QUEST: Quantum Enhanced Superfluid Technologies for dark matter and cosmology
QUEST: Quasar/ULIRG Evolution STudy experiment
QuIC: European Quantum Industry Consortium
QUIET: Q/U Imaging ExperimenT (Q and U are Stokes parameters)

R

RAD: Rapidity anomalous dimension
RADES: Relic Axion Detector Exploratory Setup
RADICAL: Research in Advanced Distributed Cyberinfrastructure and Applications
RAID: Redundant array of inexpensive disks
RAL: STFC Rutherford Appleton Laboratory near Oxford
RAMBO: RAndom Momenta BOoster multi-particle phase space generator
RAMSES: Adaptive Mesh Refinement code for self-gravitating magnetized fluid flows, apparently not an acronym
RAN: Radio Access Network
RAS: Russian Academy of Sciences
RAVE: RAdial Velocity Experiment star survey
RC: Renormalization constant
RCMM: Liverpool's Research Centre in Mathematics and Modelling
RCNP: Research Center for Nuclear Physics at Osaka University
rcBK: Running coupling Balitsky and Kovchegov
RChL: Resonance chiral lagrangian
RChT: Resonance chiral theory
RCS: Rapid cycling synchrotron at J-PARC
RDM: Relativistic diffusion model
RDMA: Remote direct memory access
RDMS: Russia and Dubna Member States
RECOLA: REcursive Computation of One-Loop Amplitudes
RENO: Reactor Experiment for Neutrino Oscillation at Yeonggwang, Korea
REST: Representational State Transfer
REWSB: Radiative electroweak symmetry breaking
RFT: Reggeon Field Theory
RGE: Renormalization group equation
RGI: Renormalization group improvement (NOT invariant)
RGI: Renormalization group invariant
RGW: Relic gravitational wave
RGZ: Refined Gribov and Zwanziger formalism
RHIC: Relativistic Heavy Ion Collider
RHN: Right-handed neutrino
RI/MOM: Regularization-independent momentum subtraction renormalization scheme
RI/SMOM: Regularization-independent symmetric-momentum subtraction renormalization scheme
RIB: Radioactive ion beam
RICAP: Roma International Conference on Astro-Particle physics
RIDE: Radiative Inflation and Dark Energy
RIKEN: Japanese Institute of Physical and Chemical Research (Rikagaku Kenkyusho)
RIPPER: Repeated. Incremental Pruning to Produce Error Reduction (data mining algorithm)
RIVET: Robust Independent Validation of Experiment and Theory toolkit
RL: Reinforcement (machine) learning
RMACC: Rocky Mountain Advanced Computing Consortium
RMF: Relativistic mean-field framework
RMS: Robertson, Mansouri and Sexl
RMS: Root-mean-square
RN: Reissner and Nordstrom
RNP: International Workshop Relativistic Nuclear Physics from Hundreds of MeV to TeV
RNS: Ramond, Neveu and Schwarz superstring
RnuMDM: Model relating radiative seesaw and minimal dark matter mass scales with only SM gauge group
ROC: Receiver operating characteristic of signal efficiency as function of background efficiency
ROC: Remote operations center
ROCm: Radeon Open Compute platform
ROI: Rest observer at infinity
ROSAT: Röntgen Satellite (1990s X-ray observatory)
RP: Reaction plane
RP: Real projective space
RPA: Random phase approximation
RPV: R-parity violating
RQED: Dimensionally reduced quantum electrodynamics
RQM: Relativistic quantum mechanics
RR: Ramond--Ramond
RRTF: Rapid Reaction Task Force
RSA: Rivest, Shamir and Adleman encryption algorithm
RSc: Randall-Sundrum model with custodial protection
RSD: Redshift Space Distortion measurement relevant to dark matter
RSOS: Restricted solid-on-solid
RSS: Royal Statistical Society
RTG: Radioisotope thermoelectric generators
RTN: Reconfigurable Transputer Network
RTN: Research Training Network
RTO: Research and Technology Organisation
RUEDI: Relativistic Ultrafast Electron Diffraction and Imaging Facility
RVB: Resonating valence bond
RWP: Radiation Work Permit
RWTH: Rheinisch-Westfaelische Technische Hochschule
RX-DMFIT: Radio and X-ray extension of the gamma-ray fitting tool DMFIT
RXTE: Rossi X-ray Timing Explorer

S

S&FE: Schools and Further Education committee of the IMA
SAB: Strategic Advisory Board
SACOT: Simplified ACOT renormalization scheme
SAdS: Schwartzchild anti-de Sitter
SAGE: Soviet-American Gallium Experiment
SAID: Scattering Analysis Interactive Dial-in
SAIP: South African Institute of Physics
SAMPLE: Parity-violating electron scattering experiment at MIT, acronym unknown
SAMURAI: Scattering AMplitudes from Unitarity-based Reduction Algorithm at the Integrand level
SANC: Support of Analytic and Numeric Calculations for Experiments at Colliders
SAP: Schwarz alternating procedure
SAPHIR: Spectrometer Arrangement for Photon induced Reactions experiment at ELSA
SAPPHiRE: Small Accelerator for Photon-Photon Higgs production using Recirculating Electrons
SARAH: Mathematica package for building and analyzing (not only) supersymmetric theories, apparently not an acronym
SAS: Small Astronomical Satellite
SAS: Statistical Analysis System developed by Statistical Analysis Software
SB&F: Science Books & Films project of AAAS
SBND: Short-Baseline Near Detector for neutrinos at Fermilab
SBRI: Small Business Research Initiative in the UK
SCaN: Space Communications and Navigation program at NASA
SCET: Soft collinear effective theory
SCET_G: Soft-collinear effective theory with Glauber gluons
SCF: Strong color fields
SciBooNE: SciBar Booster Neutrino Experiment
Scotogenic: Caused by darkness (dark matter or dark energy)
SPAM: State preparation and measurement errors in quantum computing
SPSC: SPS and PS experiments Committee
SD: Single diffraction
SDE: Schwinger--Dyson equation
SdS: Schwarzschild and de Sitter
SDSS: Sloan Digital Sky Survey
SDWI: Strongly dissipative warm inflation
SecDec: Sector decomposition
SED: Spectral energy distribution
SELEX: Segmented Large X baryon spectrometer at Fermilab
SELFAS: Simulation of ELectric Field emitted by Air Shower program
SENSEI: Sub-Electron-Noise Skipper-CCD Experimental Instrument
SESAME: Synchrotron-light for Experimental Science and Applications in the Middle East
SET: Symmetry-enriched topological order
SET: Strategic Energy Technology
SFB: Sonderforschungsbereich (Collaborative Research Center)
SFI: Catalog of field spiral galaxies derived from the I-band Tully--Fisher relation
SFitter: An analysis tool to determine supersymmetric model parameters from collider measurements
SFT: String field theory
SGE: Sun Grid Engine
SGR: Soft gamma repeater
SGS: Subgrid Scale
SHALON: Extensive Air Showers from Neutrino (in Russian)
SHARE: Statistical HAdronization with REsonances code
SHERPA: Simulation of High-Energy Reactions of PArticles event generator
SHINE: SPS Heavy Ion and Neutrino Experiment
SHiP: Search for Hidden Particles experiment proposed at CERN
SHIP: Separator for Heavy Ion reaction Products at GSI
SHIPS: Solar Hidden Photon Search in Hamburg
SHM: Statistical hadronization model
SHOES: Supernova H0 for the Equation of State experiment on the Hubble Space Telescope
SHUMR: Shifted unitary minimal residual algorithm
SIAM: Single-impurity Anderson model
SIAM: Society for Industrial and Applied Mathematics
SIBYLL: Cosmic ray interaction event generator, apparently not an acronym
SiD: Silicon Detector for the ILC
SIDIS: Semi-inclusive deep inelastic scattering
SiFCC: Silicon Future Circular Collider detector
SIGHPC: ACM's Special Interest Group on High Performance Computing
SILAFAE: Simposio Latinoamericano de Física de Altas Energías
SILH: Strongly interacting light Higgs
SIMD: Single instruction, multiple data computers
SIMP: Strongly interacting massive particle
SIMPLE: Superheated Instrument for Massive ParticLe Experiments
SINFONI: Spectrograph for INtegral Field Observations in the Near Infrared
SIS: Schwer-Ionen Synchrotron (Heavy Ion Synchrotron) at GSI
SISCone: Seedless infrared-safe cone jet algorithm
SJ: String Junction
SK: Super-Kamiokande
SK: Schwinger and Keldysh
SKA: Square-Kilometer Array
SLAC: Stanford Linear Accelerator Center
SLag: Special Lagrangian
SLAM: Supersymmetry Les Houches Accord with Mathematica
SLD: SLAC Large Detector
SLHA: Supersymmetry Les Houches Accord
SLHM; Simplest little Higgs model
SLIC: Storage Lustre Interface Cluster
SLIM: Dark matter Scalar as LIght as MeV
SLIM: Search for LIght magnetic Monopoles
SLiNC: Stout Link Non-perturbative Clover fermion action
SLOCC: Stochastic local operations and classical communication
SLURM: Simple Linux Utility for Resource Management
SMASH: Simulating Many Accelerated Strongly-interacting Hadrons transport approach
SMASH: Standard model Axion Seesaw Higgs portal inflation
SMC: Sequential Monte Carlo (also known as particle filter methods)
SMC: Small Magellanic Cloud
SMD: Stochastic molecular dynamics
SME: Standard Model Extension framework
SMFNS: Symposium on Strong electroMagnetic Fields and Neutron Stars
SMG: Standard model group
SModelS: Simplified Model Spectrum topologies and package for analyzing them
SMOG: System for Measuring Overlap with Gas in LHCb
SMS: Simplified Model Spectrum topologies
sMSSM: Secluded-U(1)-extended MSSM
SNAP: Supernova/Acceleration Probe
SND: Spherical Neutral Detector at VEPP
SND@LHC: Scattering and Neutrino Detector at the LHC
SNEWS: Supernova Early Warning System
SNF: Supernova feedback to produce cored galaxy
SNLS: Supernovae Legacy Survey
SNM: Special nuclear material
SNO: Sudbury Neutrino Observatory
SNOwGLoBES: SuperNova Observatories with GLoBES
SNOP: Standard neutrino oscillation phenomenology
SNP DFS RAS: Section of Nuclear Physics, Physical Sciences Division of the Russian Academy of Sciences
SNR: Supernova remnant
SNS: Spallation Neutron Source at Oak Ridge
SNS: Something at the Rutherford Appleton Lab, now called ISIS, which is not an acronym
SNS: Superconductor--normal--superconductor Josephson junction
SNSI: Secret National Security Information
SNU: Solar neutrino unit
SOKENDAI: Graduate University for Advanced Studies (Sogo kenkyu daigakuin daigaku)
SOKOL: SOlnechnye KOLebaniya (Solar Oscillations) photometer, 1985--1986
SoLID: Solenoidal Large Intensity Device proposed for Jlab
SOPHIA: Simulations Of Photo-Hadronic Interactions in Astrophysics
SOPHIE: Spectrographe pour l'Observation des Phenomenes des Interieurs stellaires et des Exoplanetes in France
SOS: Solid-on-Solid
SOTR: Subcontracting Officer's Technical Representative
SOX: Short distance neutrino Oscillations with BoreXino
SPARC: Spitzer Photometry and Accurate Rotation Curves database
SPD: Spin Physics Detector at NICA at JINR
SPE: Synergistic Processor Element of Cell processor
SPEAR: Stanford Positron Electron Accelerating Ring
SEPCTRUM: Shaping Public hEalth poliCies to Reduce ineqUalities and harM consortium
sPHENIX: Proposed upgrade of PHENIX, apparently featuring a superconducting solenoid magnet
SPheno: Supersymmetric Phenomenology program for calculating spectrum and decays
SPheRIO: Smoothed Particle hydrodynamic evolution of Relativistic heavy IOn collisions
SPI: SPectrometer on INTEGRAL
SPICE: Simulation Package for Including flavor in Collider Events
SPIDER: Spectral Interferometry for Direct Electric Field Reconstruction
SPIE: Society of Photographic Instrumentation Engineers (no longer used)
SPIRAL: Système de Production dIons Radioactifs avec Accélération en Ligne
SPIRE: Spectral and Photometric Imaging Receiver on the Herschel Space Observatory
SPL: Superconducting Proton Linac at CERN
SppC: Super proton--proton Collider proposed in China
SPQCDR: Southampton, Paris and Rome QCD Collaboration
SPOR: Statistics, Probability and Operations Research
SPring-8: Super Photon ring at 8 GeV
SPS: Snowmass Points and Slopes
SPS: Super Proton Synchrotron at CERN
SPSS: Statistical Package for the Social Sciences
SPT: South Pole Telescope
SPT: Symmetry-protected trivial or symmetry-protected topological orders
SPTpol: A polarization-sensitive camera on SPT
sQGP: Strongly interacting quark--gluon plasma
SQM: Strange quark matter
SQUID: Superconducting quantum interference device
SONIC: Super hybrid mOdel simulationN for relativistic heavy-Ion Collisions
SRD: Secret Restricted Data
SRF: Superconducting radiofrequency
SRS: Synchrotron Radiation Source formerly at Daresbury
SSA: Single-spin asymmetry
SSA: Storage Systems Administration
SSC: Solid-state Slit Camera on MAXI
SSC: Superconducting Supercollider
SSC: Synchrotron self-Compton scattering
SSDL: Same sign dilepton channel
SSE: Streaming SIMD extensions
SSM: Sequential standard model
SSOR: Symmetric successive over-relaxation
SSP: Subaru Strategic Program for telescope on Mauna Kea
STAR: Solenoidal Tracker At RHIC
STARS: Caribbean Symposium on Cosmology, Gravitation, Nuclear and Astroparticle Physics, apparently not an acronym
STEM: Scanning transmission electron microscopy
STFC: UK Science and Technology Facilities Council
STM: Scanning tunneling microscopy
STU: Model that exhibits both exact S- and T-dualities
STXS: Simplified Template Cross Sections
sUED: Singlet-extended universal extra dimension
SuGAR: Searching for the sources of GAlactic cosmic Rays workshop
SUMR: Shifted Unitary Minimal Residual algorithm
SUNLAB: Underground laboratory in the Polkowice--Sieroszowice mine in Poland
SuperIso: Program for calculating flavor observables, focusing on isospin asymmetries in susy models
SURA: Southeastern Universities Research Association
SURF: Sanford Underground Research Facility in South Dakota
SuSA: SuperScaling Approach for neutrino--nucleus scattering
SusHi: Supersymmetric Higgs, program to calculate production cross sections
SVD: Spectrometer with Vertex Detector at IHEP
SVG: Scalable Vector Graphics
SVZ: Shifman, Vainshtein and Zakharov
SW: Sheikholeslami and Wohlert
SWME: Staggered fermion Weak Matrix Element Collaboration
SYK: Sachdev, Ye and Kitaev model
SYZ: Strominger, Yau and Zaslow conjecture that mirror symmetry is T-duality
SZ: Sunyaev and Zeldovich galaxy cluster effect

T

T2HK: Tokai to Hyper-Kamiokande
T2HKK: Tokai to Hyper-Kamiokande and Korea
T2K: Tokai to Kamioka
T2KK: Tokai to Kamioka and Korea
TA: Telescope Array air shower experiment in Utah
TALE: Telescope Array Low Energy extension
TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry
TAPAS: The Antiproton Annihilation Spectrometer at Fermilab
TAPS: Two-Arm Photon Spectrometer, has been used in the SPEAR detector at SLAC, the Crystal Ball detector at the Mainz Microtron, and perhaps teh Crystal Barrel Detektor at the Elektronen Stretcher Anlage in Bonn as well
TASCA: TransActinide Separator and Chemistry Apparatus at GSI
TASEP: Totally asymmetric simple exclusion process
TASK: Teilchen-, AStro- und Kernphysik in the Swiss Physical Society
TASSO: Two Arm Spectrometer Solenoid at DESY's PETRA
TAU: Tuning and Analysis Utilities performance analysis system
TAUOLA: Monte Carlo generator for tau lepton decays, apparently not an acronym
TAUP: Topics in Astroparticle and Underground Physics
TBA: Thermodynamic Bethe Ansatz
TBM: Tri-bimaximal mixing
TCC: Transplanckian Censorship Conjecture
TCE: TTA-based Co-design Environment
TCS: Timelike Compton scattering
TDA: Transition distribution amplitude
TDAQ: Trigger and Data Acquisition
TDGL: Time-dependent Ginzburg and Landau model
TE: Temperature and E-mode cross-correlation
TEA: Tung et al.
TEAM: Transmission Electron Aberration-Corrected Microscope
TEBD: Time-evolving block decimation tensor network method
TECHQM: Theory-Experiment Collaboration for Hot QCD Matter
TED: Technology and Engineering Development building at JLab
TED: Technology, Entertainment, Design conferences
TEK: Twisted Eguchi--Kawai model
TEM: Transmission electron microscopy
TERB: Tensor-entanglement renormalization group tensor network method
TES: Transition-edge sensor
TESLA: Teraelectronvolt Energy Superconducting Linear Accelerator
TESS: Transiting Exoplanet Survey Satellite launched by NASA in 2018
TeVeS: Modified Newtonian Dynamics with Tensor, Vector and Scalar fields
TEXONO: Taiwan Experiment on Neutrino
TF: Tully and Fisher
TFF: Transition form factor
TFH: Toorop, Feruglio and Hagedorn neutrino mixing patterns
TGAS: Tycho--Gaia Astrometric Solution combining the two data catalogs
THEIA: Proposed ESA satellite mission to study motion of faint astronomical objects in the Milky Way, apparently not an acronym
THEIA: Telescopic High-definition Earth Imaging Apparatus
THINGS: The HI Nearby Galaxy Survey
THOR: Theory of HOt matter and Relativistic heavy-ion collisions COST Action
TIAA: Teachers Insurance and Annuity Association
TikZ: LaTeX graphics package, apparently not an acronym
TILW: Tadpole improved Luescher-Weisz action
TJNAF: Thomas Jefferson National Accelerator Facility
TKNN: Thouless, Kohmoto, Nightingale and den Nijs number describing integer Hall conductivity
TL: Toda lattice
TLB: Translation lookaside buffer
TLEP: Triple Large Electron--Positron Collider
TM: Tri-maximal mixing
TMD: Tech company founded as Thorn Microwave Devices
TMD: Transverse momentum dependent parton distribution function
TMT: Thirty Meter Telescope proposed in Hawaii
TNE: Transnational education
TNS: Tensor network states
TOPAS: TOol for PArticle Simulation
TOPAZ: Detector at TRISTAN, acronym unknown, may be related to top quark
TOPIXS: TOP-pair Inclusive CROSS Section program
TOSS: Tri-lab Operating System Stack
TOTEM: TOTal cross section, Elastic scattering and diffraction dissociation Measurement at the LHC
TOV: Tolman, Oppenheimer and Volkoff
TPC: Time projection chamber
TPE: Two-photon exchange
TQFT: Thermal Quantum Field Theory and its Applications workshop series
TQFT: Topological quantum field theory
TREPS: Two-photonic REsonance Production Simulator
TRINAT: TRIUMF's Neutral Atom Trap
TRISTAN: Transposable Ring Intersecting Storage Accelerator in Nippon
TRIUMF: Originally TRI-University Meson Facility, now name of Canadian lab
TRV: Time-reversal violation
TS-PHMC: Two-Step Polynomial Hybrid Monte Carlo
TSSCPP: Totally symmetric self-complementary plane partition
TTA: Transport-Triggered Architecture
TTM: Top triangle moose
TUM: Technical University Munich
TUNL: Triangle Universities Nuclear Laboratory
TVID: Three-loop Vacuum Integrals from Dispersion relations Mathematica package
TWIST: TRIUMF Weak Interaction Symmetry Test
TXS: Texas Survey of astronomical radio sources
TYL: Toshiko Yuasa (1909--1980) Laboratory

U

UCAS: UK Universities and Colleges Admissions Service
UCN: Ultra-cold neutron
UCNA: Experiment to measure the Ultra-cold neutron "A-correlation" between the neutron's spin and its decay electron's momentum
UDM: Unified dark matter
UE: Underlying event
UED: Universal extra dimension
UERJ: Universidade do Estado do Rio de Janeiro
UFB: Unbounded from below
UFO: Universal FeynRules output file format
uGNI: User-level Generic Network Interface
UHECR: Ultra-high-energy cosmic ray
ULIRG: Ultraluminous infrared galaxy
UMSSM: U(1)-extended Minimal Supersymmetric Standard Model
uPDF: Unintegrated parton density function
URA: Universities Research Association
UrQMD: Ultra-relativistic quantum molecular dynamics
U-spin: SU(2) subgroup of flavor-SU(3) in which (d, s) are a doublet and u a singlet
USTFM: Unified Statistical Thermal Freeze-out Model of heavy-ion collisions
UT: Unitarity triangle
UTA: Unitarity triangle analysis
UTM: Upstream transverse momentum
UVES: Ultraviolet and Visual Echelle Spectrograph on the VLT

V

VAMPIR: Visualisation and Analysis of MPI Resources
VARC: Virginia Associated Research Campus at JLab
VBC: Valence bond crystal
VBF: Vector boson fusion
VBSCan: Vector Boson Scattering Coordination and Action Network
VECC: Variable Energy Cyclotron Centre in Kolkata
VEGAS: Algorithm to reduce errors in Monte Carlo calculations
VELO: VErtex LOcator LHCb sub-detector near the collision site
VENUS: VErsatile National Lab and Universities Spectrometer
VEPP: Electron-positron storage ring at the BINP
VERITAS: Very Energetic Radiation Imaging Telescope Array System
VES: VErtex Spectrometer at IHEP
VFNS: Variable Flavor Number Scheme
VGG: Vanderhaeghen, Guichon and Guidal
VHDL: VHSIC hardware description language
vHLLE: viscous hydrodynamics model based on the relativistic approximate Reimann solver of Harten, Lax, van Leer and Einfeldt
VHM: Very high multiplicity
VHSIC: Very-high-speed integrated circuits
VIKING: VISTA Kilo-Degree Infrared Galaxy Survey
VINCIA: Virtual Numerical Collider with Interleaved Antennae
VIRGO: Gravitational wave detector at EGO, apparently not an acronym
VISTA: Visible and Infrared Survey Telescope for Astronomy of ESO
VLA: Very Large Array of radio antennas run by the NRAO
VLBA: Very Long Baseline Array of radio telescopes run by the NRAO
VLBI: Very Long Baseline Interferometry consortium in Europe
VLENF: Very Low Energy Neutrino Factory, now nuSTORM
VLT: Very Large Telescope of ESO
VLTI: Very Large Telescope Interferometer of ESO
VLVnT: Very Large Volume Neutrino Telescopes workshop
VMD: Vector meson dominance
VME: VERSAmodule Eurocard bus
VNI: Parton cascade model code, acronym unknown
vNRQCD: Non-relativistic QCD matched to MSbar using a subtraction velocity rather than a subtraction scale
VSBL: Very short baseline
VSI: Vanishing Scalar Invariant
VSR: Very special relativity
VST: VLT Survey Telescope at ESO
VTR: Vault-Type Room at Livermore
VUV: Vacuum ultraviolet

W

WARP: Wimp Argon Programme
WASA: Wide Angle Shower Apparatus, once at CELSIUS, now at COSY
WATCHMAN: WATer CHerenkov Monitor for Anti-Neutrinos non-proliferation experiment at AIT
WB: Weak basis
wCDM: Cold dark matter model with free (constant) EOS w for dark energy
WCI: Weapons and Complex Integration at Livermore
WDM: Warm dark matter
WDRS: Workforce Development and Resources Section at Fermilab
WDVV: Witten, Dijkgraaf, Verlinde and Verlinde
WDWI: Weakly dissipative warm inflation
We: Electrical Watt
WEP: Weak equivalence principle
WF: Wilson and Fisher
WFCTA: Wide-Field-of-view Cherenkov Telescope Array in the LHAASO project
WFIRST: Wide Field Infrared Survey Telescope aimed to launch in 2020s
WGC: Weak Gravity Conjecture
WGMP: Workshop on Geometric Methods in Physics
WHDG: Wicks, Horowitz, Djordjevic and Gyulassy
WHIZARD: Monte Carlo event generator, apparently not an acronym
WIMT: Weitzenböck induced matter theory
WINHAC: Monte Carlo event generator for single W-boson production at hadron colliders
WISP: Weakly interacting sub-eV particle
WKB: Wentzel, Kramers and Brillouin
WKBJ: Wentzel, Kramers, Brillouin and Jeffreys
WMAP: Wilkinson Microwave Anisotropy Probe
WONP: Workshop On Nuclear Physics
WPCF: Workshop on Particle Correlations and Femtoscopy
WRAP: Waste & Resources Action Programme
Wth: Thermal Watt
WWND: Winter Workshop on Nuclear Dynamics
WZ: Wess and Zumino
WZNW: Wess, Zumino, Novikov, and Witten

X

XEFT: Low-energy effective theory for the X(3872)
XFEL: X-ray free electron laser
XFIRST: Wide Field Infrared Survey Telescope
XG: Xu and Greiner
XIS: X-ray Imaging Spectrometer
XMASS: All of (1) Xenon MASSive detector for solar neutrino, (2) Xenon detector for weakly interacting MASSive particles, (3) Xenon neutrino MASS detector
XMM-Newton: X-ray Multi-Mirror Mission of the ESA
XQC: X-ray Quantum Calorimetry rocket experiment reused for dark matter searches
XRISM: X-ray Imaging and Spectroscopy Mission
XRT: X-ray telescope
XSEDE: Extreme Science and Engineering Discovery Environment

Y

YaJEM: Yet another Jet Energy-loss Model
YBCO: Yttrium barium copper oxide
YETI: Young Experimentalists and Theorists Institute
YFS: Yennie, Frautschi and Suura
YMH: Yang, Mills and Higgs
Yp: Primordial helium abundance (mass fraction)
YSO: Young stellar object
YSS: Young Statisticians' Section of the RSS
YTF: Young Theorists' Forum at Durham
YUMGUT: Yukawon Ultra Minimal Grand Unified Theory

Z

ZAMO: Zero angular momentum observer
ZDC: Zero degree calorimeter
ZEPLIN: Liquid Xenon and proportional scintillation dark matter experiment
ZiF: Zentrum für interdisziplinäre Forschung at Bielefeld
ZTF: Zwicky Transient Facility at Palomar

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