0000000001232286

AUTHOR

G. Faif

showing 2 related works from this author

Measurement of W-pair production in e+e- collisions at 183 GeV

1999

The production of W+W- pairs is analysed in a data sample collected by ALEPH at a mean centre-of-mass energy of 182.7 GeV, corresponding to an integrated luminosity of 57 pb-1. Cross sections are given for different topologies of W decays into leptons or hadrons. Under Standard Model assumptions for the W-pair production and decay, the W-pair cross section is measured to be 15.57+-0.62(stat.)+-0.29(syst.) pb. Using also the W-pair data samples collected by ALEPH at lower centre-of-mass energies, the decay branching ratio of the W boson into hadrons is measured to be B(W->hadrons)= 68.93+-1.21(stat.)+-0.51(syst.)%, allowing a determination of the CKM matrix element |Vcs|= 1.043 +- 0.058(s…

Nuclear and High Energy PhysicsAlephParticle physicsALEPH Experiment; LEP; W-pair productionElectron–positron annihilationHadronFOS: Physical sciences01 natural sciencesHigh Energy Physics - ExperimentALEPH ExperimentHigh Energy Physics - Experiment (hep-ex)0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physicsNuclear ExperimentBhabha scatteringPhysicsW-pair production010308 nuclear & particles physicsBranching fractionCabibbo–Kobayashi–Maskawa matrixLEPPair productionHigh Energy Physics::ExperimentParticle Physics - ExperimentLepton
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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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