0000000000756997

AUTHOR

G. Mamier

showing 3 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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Searches for the neutral Higgs bosons of the MSSM in e+e− collisions at centre-of-mass energies of 181–184 GeV

1998

The data collected by ALEPH at LEP at centre-of-mass energies ranging from 181 to 184 GeV, corresponding to an integrated luminosity of 57 pb(-1), are analysed to search for pair-produced neutral Higgs bosons h and A, in the b (b) over bar b (b) over bar and tau(+)tau(-)b (b) over bar final states. Two events are found in the data with 2.5 expected from standard model processes. When combined with the lower energy data collected by ALEPH and with earlier reported searches for associated hZ production, these analyses are interpreted in the context of the minimal supersymmetric extension of the standard model (MSSM). For standard choices of MSSM parameter sets, this combination results in 95%…

PhysicsNuclear and High Energy PhysicsParticle physicsLuminosity (scattering theory)010308 nuclear & particles physicsHiggs bosonContext (language use)LEPParameter spaceALEPH Experiment; LEP; Higgs boson01 natural sciencesStandard ModelNuclear physicsALEPH Experiment0103 physical sciencesHiggs boson010306 general physicsALEPH experimentParticle Physics - ExperimentBar (unit)Boson
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Search for the standard model Higgs boson at the LEP2 collider near

1998

Abstract During 1997 the ALEPH experiment at LEP gathered 57 pb −1 of data at centre-of-mass energies near 183 GeV . These data are used to look for possible signals from the production of the Standard Model Higgs boson in the reaction e+e−→HZ. No evidence of a signal is found in the data; seven events are selected, in agreement with the expectation of 7.2 events from background processes. This observation results in an improved lower limit on the mass of the Higgs boson: m H >87.9 GeV /c 2 at 95% confidence level.

PhysicsALEPH Experiment; LEP; higgs bosonNuclear and High Energy PhysicsParticle physicsHigh Energy Physics::PhenomenologyLEPhiggs bosonLower limitlaw.inventionStandard ModelALEPH ExperimentNuclear physicslawHiggs bosonHigh Energy Physics::ExperimentColliderALEPH experimentPhysics Letters B
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