Search results for "EINSTEIN CORRELATIONS"

showing 10 items of 16 documents

Kaon femtoscopy in Pb-Pb collisions at √sNN=2.76 TeV

2017

We present the results of three-dimensional femtoscopic analyses for charged and neutral kaons recorded by ALICE in Pb-Pb collisions at √ s NN = 2.76 TeV. Femtoscopy is used to measure the space-time characteristics of particle production from the effects of quantum statistics and final-state interactions in two-particle correlations. Kaon femtoscopy is an important supplement to that of pions because it allows one to distinguish between different model scenarios working equally well for pions. In particular, we compare the measured three-dimensional kaon radii with a purely hydrodynamical calculation and a model where the hydrodynamic phase is followed by a hadronic rescattering stage. The…

:Kjerne- og elementærpartikkelfysikk: 431 [VDP]Pb-PbHadronNuclear TheoryPb-Pb collisionshiukkasfysiikkaHEAVY-ION COLLISIONSPPCOLLABORATION7. Clean energy01 natural sciencesParticle identificationHYDRODYNAMICSALICEDEPENDENCENuclear ExperimentPhysicsCOULOMB CORRECTIONSTime projection chamberLarge Hadron ColliderVDP::Kjerne- og elementærpartikkelfysikk: 431PRIRODNE ZNANOSTI. Fizika.:Nuclear and elementary particle physics: 431 [VDP]VDP::Nuclear and elementary particle physics: 431BOSE-EINSTEIN CORRELATIONSTransverse massLHCkaonParticle physicsNuclear and High Energy PhysicskaonsNuclear physicsINTERFEROMETRYPionfemtoscopy0103 physical sciencesNuclear and High Energy Physics; ALICE; LHCPARTICLESparticle physics010306 general physicsScalingNuclear and High Energy Physicta114010308 nuclear & particles physics2.76TeVHEAVY-ION COLLISIONS; BOSE-EINSTEIN CORRELATIONS; COULOMB CORRECTIONS; INTERFEROMETRY; MATTER; PP; COLLABORATION; HYDRODYNAMICS; DEPENDENCE; PARTICLESBose–Einstein correlationsNATURAL SCIENCES. Physics.High Energy Physics::ExperimentMATTERkaon femtoscopy Pb-Pb 2.76TeV
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Studies of Quantum Chromodynamics with the ALEPH Detector

1998

Previously published and as vet unpublished QCD results obtained with the ALEPH detector at LEP1 are presented. The unprecedented statistics allows detailed studies of both perturbative and non-perturbative aspects of strong interactions to be carried out using hadronic Z and tau decays. The studies presented include precise determinations of the strong coupling constant. tests of its flavour independence, tests of the SU(3) gauge structure of QCD, study of coherence effects, and measurements of single-particle inclusive distributions and two-particle correlations for many identified baryons and mesons. (C) 1998 Elsevier Science B.V.

AlephParticle physicsMesonHigh Energy Physics::LatticeElectron–positron annihilationHadronAleph; LEP; QCD; Quantum Chromo DynamicsGeneral Physics and Astronomy01 natural sciencesNuclear physicsQuantum Chromo Dynamics0103 physical sciencesBibliography010306 general physicsPhysicsQuantum chromodynamics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyLEPBose–Einstein correlationsQCDALEPH detectorBaryonHigh Energy Physics::ExperimentAlephParticle Physics - Experiment
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Bose-Einstein correlations in W-pair decays

2000

Bose-Einstein correlations are studied in semileptonic (WW --> q (q) over bar lv) and fully hadronic (WW --> q (q) over bar q (q) over bar) W-pair decays with the ALEPH detector at LEP at centre-of-mass energies of 172, 183 and 189 GeV. They are compared with those made at the Z peak after correction for the different flavour compositions. A Monte Carlo model of Bose-Einstein correlations based on the JETSET hadronization scheme was tuned to the Z data and reproduces the correlations in the WW --> q (q) over bar lv events. The same Monte Carlo reproduces the correlations in the WW --> q (q) over bar q (q) over bar channel assuming independent fragmentation of the two W's. A variant of this …

Condensed Matter::Quantum GasesPhysicsNuclear and High Energy PhysicsParticle physicsBose Einstein correlations010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyLEPBose–Einstein correlations01 natural sciencesALEPH ExperimentNuclear physicsALEPH Experiment; LEP; Bose Einstein correlations0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]High Energy Physics::Experiment010306 general physicsALEPH experimentParticle Physics - Experiment
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Two-particle correlations in pp, (p)over-bar(p)over-bar and (KSKS0)-K-0 pairs from hadronic Z decays

2005

Two-particle correlations in pp, and pairs have been studied in hadronic Z decays recorded at LEP with the ALEPH detector. The correlations were measured as a function of the four-momentum difference Q of the pair. For pp, pairs a depletion of events is observed in the region , and for pairs an enhancement of events is observed in the region . These features are consistent with expectations from Fermi–Dirac and Bose–Einstein statistics, respectively.

INTERFERENCEINTERFEROMETRYZ(0) DECAYSBOSE-EINSTEIN CORRELATIONSLEPANNIHILATIONALEPHDETECTORMESONSMULTIPLE PRODUCTION
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Bose-Einstein correlations in charged current muon-neutrino interactions in the NOMAD experiment at CERN

2004

Bose-Einstein Correlations in one and two dimensions have been studied, with high statistics, in charged current muon-neutrino interaction events collected with the NOMAD detector at CERN. In one dimension the Bose-Einstein effect has been analyzed with the Goldhaber and the Kopylov-Podgoretskii phenomenological parametrizations. The Goldhaber parametrization gives the radius of the pion emission region R_G = 1.01+/-0.05(stat)+0.09-0.06(sys) fm and for the chaoticity parameter the value lambda = 0.40+/-0.03(stat)+0.01-0.06(sys). Using the Kopylov-Podgoretskii parametrization yields R_KP = 2.07+/-0.04(stat)+0.01-0.14(sys) fm and lambda_KP = 0.29+/-0.06(stat)+0.01-0.04(sys). Different paramet…

Nuclear and High Energy PhysicsParticle physicsBose-Einstein; correlations charged current; muon-neutrino interaction; NOMADHadronFOS: Physical sciences01 natural sciencesHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)Pion0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Muon neutrinoRapidity010306 general physicsNuclear ExperimentCharged currentPhysicsLarge Hadron Collider010308 nuclear & particles physicsFísicaBose–Einstein correlationsCharged particleHigh Energy Physics::ExperimentAstrophysics::Earth and Planetary AstrophysicsParticle Physics - Experiment
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Charged kaon femtoscopic correlations inppcollisions ats=7  TeV

2013

Correlations of two charged identical kaons (KchKch) are measured in pp collisions at root s = 7 TeV by the ALICE experiment at the Large Hadron Collider (LHC). One-dimensional (KKch)-K-ch correlation functions are constructed in three multiplicity and four transverse momentum ranges. The (KKch)-K-ch femtoscopic source parameters R and lambda are extracted. The (KKch)-K-ch correlations show a slight increase of femtoscopic radii with increasing multiplicity and a slight decrease of radii with increasing transverse momentum. These trends are similar to the ones observed for pi pi and K-s(0) K-s(0) correlations in pp and heavy-ion collisions. However at high multiplicities, there is an indica…

Nuclear and High Energy PhysicsParticle physicsCOLISÕES DE ÍONS PESADOS RELATIVÍSTICOSLambda01 natural sciencesDECAYSNuclear physicsINTERFEROMETRYPion0103 physical sciences010306 general physicsNuclear ExperimentPhysicsBOSE-EINSTEIN CORRELATIONS; COULOMB CORRECTIONS; INTERFEROMETRY; INTERFERENCE; DECAYS; Z(0)COULOMB CORRECTIONSINTERFERENCELarge Hadron Collider010308 nuclear & particles physicsPhysicsMultiplicity (mathematics)Bose–Einstein correlationsZ(0)BOSE-EINSTEIN CORRELATIONSTransverse momentumHigh Energy Physics::Experimentkaon ; correlation ; ALICEPhysical Review D
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Measurement of the mass of the W boson using direct reconstruction at √s = 183 GeV

1999

From data corresponding to an integrated luminosity of 53.5 pb(-1) taken during the 183 GeV run in 1997, DELPHI has measured the W mass from direct reconstruction of WW --> lq (q) over bar and WW --> q (q) over bar q (q) over bar events. Combining these channels, a value of m(w) = 80.238 +/- 0.154(stat) +/- 0.035(syst) +/- 0.035(fsi) +/- 0.021 (LEP) GeV/c(2) is obtained, where fsi denotes final state interaction. Combined with the W mass obtained by DELPHI from the WW production cross-section and with the direct measurement at 172 GeV this leads to a measured value of m(w) = 80.270 +/- 0.137(stat) +/- 0.031(syst) +/- 0.030(fsi) +/- 0.021(LEP)GeV/c(2), in good agreement with the Standard Mod…

Nuclear and High Energy PhysicsParticle physicsEINSTEIN CORRELATIONSCLUSTERING-ALGORITHMElectron–positron annihilationMathematicsofComputing_GENERALCOLOR DIPOLE MODEL01 natural sciencesComputer Science::Digital LibrariesPartícules (Física nuclear)LuminosityStandard ModelPHYSICSEVENTSNuclear physicsLEP20103 physical sciencesMONTE-CARLO PROGRAM[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]ANNIHILATION010306 general physicsDELPHIPhysicsAnnihilation010308 nuclear & particles physicsE(+)E(-) INTERACTIONSTheoryofComputation_GENERALLARGE ELECTRON POSITRON COLLIDERMONTE-CARLO PROGRAM; PAIR CROSS-SECTION; COLOR DIPOLE MODEL; E(+)E(-) INTERACTIONS; EINSTEIN CORRELATIONS; CLUSTERING-ALGORITHM; ANNIHILATION; PHYSICS; EVENTS; LEP2PARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHIComputer Science::Mathematical SoftwarePARTICLE PHYSICSProduction (computer science)Física nuclearPAIR CROSS-SECTIONParticle Physics - ExperimentBar (unit)
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Measurement of correlations between pions from different W's in e+e- → W+W- events

1997

Correlations between pions from different W's in e(+)e(-) --> W+W- events are studied using data collected by the DELPHI detector at LEP running at a centre-of-mass energy of 172 GeV in 1996. At the present level of statistics, no enhancement of the correlation function above that expected from a pair of uncorrelated W's is observed at small values of the four-momentum difference of the pions. (C) 1997 Published by Elsevier Science B.V.

Nuclear and High Energy PhysicsParticle physicsLUND MONTE-CARLOElectron–positron annihilationBOSE-EINSTEIN CORRELATIONS; LUND MONTE-CARLO; JET FRAGMENTATION; PHYSICS; INTERFEROMETRY; DECAYS; Z(0); Z001 natural sciencesJET FRAGMENTATIONDECAYSPartícules (Física nuclear)Nuclear physicsPHYSICSINTERFEROMETRYPionCorrelation function0103 physical sciencesZ0010306 general physicsNuclear ExperimentDELPHIPhysics010308 nuclear & particles physicsAcceleradors de partículesBose–Einstein correlationsZ(0)LARGE ELECTRON POSITRON COLLIDERUncorrelatedBOSE-EINSTEIN CORRELATIONSLarge Electron–Positron ColliderPARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHIPARTICLE PHYSICSHigh Energy Physics::Experiment
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Bose-Einstein correlations in W-pair decays with an event-mixing technique

2005

Bose-Einstein correlations in W-pair decays are studied using data collected by the ALEPH detector at LEP at e(+)e(-) centre-of-mass energies from 183 to 209 GeV. The analysis is based on the comparison of WW --> q (q) over barq (q) over bar events to "mixed" events constructed with the hadronic part of WW --> q (q) over bar lv events. The data are in agreement with the hypothesis that Bose-Einstein correlations are present only for pions from the same W decay. The JETSET model with Bose-Einstein correlations between pions from different W bosons is disfavoured. (C) 2004 Elsevier B.V. All rights reserved.

PhysicsCondensed Matter::Quantum GasesNuclear and High Energy PhysicsParticle physicsAleph010308 nuclear & particles physicsElectron–positron annihilationHadronBose–Einstein correlations01 natural sciencesNuclear physicsPion0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]High Energy Physics::ExperimentCenter of mass010306 general physicsNuclear ExperimentEvent (particle physics)Particle Physics - ExperimentBoson
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Two-pion Bose–Einstein correlations in central Pb–Pb collisions at sNN=2.76 TeV

2011

The first measurement of two-pion Bose-Einstein correlations in central Pb-Pb collisions at root(NN)-N-S = 2.76 TeV at the Large Hadron Collider is presented. We observe a growing trend with energy now not only for the longitudinal and the outward but also for the sideward pion source radius. The pion homogeneity volume and the decoupling time are significantly larger than those measured at RHIC. (C) 2010 CERN. Published by Elsevier B.V. All rights reserved.

PhysicsNuclear and High Energy PhysicsParticle physicsLarge Hadron Collider010308 nuclear & particles physicsNuclear TheoryBose–Einstein correlationsDecoupling (cosmology)01 natural sciencesNuclear physicsPion0103 physical sciencesHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsPhysics Letters B
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