0000000000379739

AUTHOR

J.m. Levy

showing 2 related works from this author

Improved measurements of cross sections and asymmetries at the Z0 resonance

1994

During the 1992 running period of the LEP e+e- collider, the DELPHI experiment accumulated approximately 24 pb-1 of data at the Z0 peak. The decays into hadrons and charged leptons have been analysed to give values for the cross sections and leptonic forward-backward asymmetries which are significantly improved with respect to those previously published by the DELPHI collaboration. Incorporating these new data, more precise values for the Z0 resonance parameters are obtained from model-independent fits. The results are interpreted within the framework of the Standard Model, yielding for the top quark mass m(t) = 157(-48)+36(expt.)-20(+19)(Higgs) GeV, and for the effective mixing angle sin2 …

Nuclear and High Energy PhysicsParticle physicsTop quarkLUND MONTE-CARLOElectron–positron annihilationLEP-SLC ENERGIESElementary particle7. Clean energy01 natural sciencesJET FRAGMENTATIONStandard ModelPHYSICSNuclear physicsBHABHA SCATTERINGParticle decay0103 physical sciencesPROGRAM[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]RADIATIVE-CORRECTIONSZ0010306 general physicsDELPHIPhysicsLOWEST-ORDER CALCULATIONScross section010308 nuclear & particles physicsDELPHI; Bhabha scattering; cross section; Z0High Energy Physics::PhenomenologyLARGE ELECTRON POSITRON COLLIDERLUND MONTE-CARLO; ELECTRON-POSITRON COLLISIONS; LOWEST-ORDER CALCULATIONS; LEP-SLC ENERGIES; BHABHA SCATTERING; RADIATIVE-CORRECTIONS; JET FRAGMENTATION; PROGRAM; PHYSICSPARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHILarge Electron–Positron ColliderHiggs bosonPARTICLE PHYSICSFísica nuclearHigh Energy Physics::ExperimentELECTRON-POSITRON COLLISIONSParticle Physics - ExperimentLepton
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Evidence for B$^{0}_{s}$ meson production in Z$^0$ decays

1992

Seven unambiguous events out of a sample of 270 000 Z0 decays, contain in tile same jet a D(s) meson and a muon at large transverse momentum relative to the et axis. These events are direct evidence for B(s)0 meson production in hadronic Z0 decays. The production rate of these events, relative to all hadronic Z0 decays is ( 18 +/- 8) x 10(-5) this number including the relevant branching fractions of the B(s)0 and D(s). The value of the B(s)0 meson lifetime relative to the average B meson lifetime is measured to be 0.8 +/- 0.4.

Nuclear and High Energy PhysicsParticle physicsMeson productionMesonLUND MONTE-CARLOElectron–positron annihilationNuclear TheoryHadron01 natural sciencesCOLLIDERNuclear physics0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]B mesonNuclear Experiment010306 general physicsPhysicsMuonLUND MONTE-CARLO; Z0 DECAYS; COLLIDER010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyZ0 DECAYSTransverse momentumFísica nuclearHigh Energy Physics::ExperimentParticle Physics - ExperimentProduction rate
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