0000000000379745

AUTHOR

T.e. Pettersen

showing 3 related works from this author

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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Measurement of inclusive production of light meson resonances in hadronic decays of the Z0

1993

A study of inclusive production of the meson resonances ρ0, K*0 (892), f{hook}0 (975) and f{hook}2 (1270) in hadronic decays of the Z0 is presented. The measured mean meson multiplicity per hadronic event is 0.83 ± 0.14 for the ρ0 0.64 ± 0.24 for the K*0 (892), 0.10 ± 0.04 for the f{hook}0 (975) in the momentum range p > 0.05pbeam (xp > 0.05) and 0.11 ± 0.05 for the f{hook}2 (1270) for xp > 0.1. These values and the corresponding differential cross sections ( 1 σhadr) dσ dxp for the vector mesons are in good agreement with the predictions of the JETSET 7.3 PS and HERWIG 5.4 models. The f{hook}2 (1270) production is overestimated by HERWIG but its xp-shape is correctly reproduced. T…

PhysicsNuclear and High Energy PhysicsParticle physicsMesonLUND MONTE-CARLO010308 nuclear & particles physicsElectron–positron annihilationHadronE+E-ANNIHILATION01 natural sciencesJET FRAGMENTATIONK+P INTERACTIONSPHYSICSNuclear physicsGEV/C0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]RHO0Física nuclearMultiplicity (chemistry)010306 general physicsParticle Physics - ExperimentLUND MONTE-CARLO; E+E-ANNIHILATION; K+P INTERACTIONS; JET FRAGMENTATION; PHYSICS; GEV/C; RHO0Physics Letters B
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A measurement of the tau lifetime

1993

The tau lepton lifetime is measured using four different methods with the DELPHI detector. Three measurements using one prong decays are combined, accounting for correlations, resulting in tau(tau) = 298 +/- 7 (stat.) +/- 4 (syst.) fs while the decay length distribution of three prong decays gives tau(tau) = 298 +/- 13 (stat.) +/- 5 (syst.) fs. The combined result is tau(tau) = 298 +/- 7 fs. The ratio of the Fermi coupling constant from tau decay relative to that from muon decay is found to be 0.985 +/- 0.013, compatible with lepton universality.

PhysicsCoupling constantParticle physicsArgusNuclear and High Energy PhysicsMuonPhysics and Astronomy (miscellaneous)010308 nuclear & particles physicsElectron–positron annihilation01 natural sciences7. Clean energyNuclear physics0103 physical sciencesDecay lengthLEPTONS[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]High Energy Physics::ExperimentFísica nuclearCombined result010306 general physicscomputerParticle Physics - ExperimentFermi Gamma-ray Space TelescopeLeptoncomputer.programming_language
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