6533b86dfe1ef96bd12cab29

RESEARCH PRODUCT

Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays

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subject

Particle physicsPhysics and Astronomy (miscellaneous)HadronFOS: Physical sciencesLIFETIMEBranching (polymer chemistry)01 natural sciencesSpectral linePartícules (Física nuclear)High Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]PRECISE MEASUREMENT010306 general physicsANNIHILATIONNuclear ExperimentEngineering (miscellaneous)DETECTORQCAstrophysics::Galaxy AstrophysicsPhysicsPRECISE MEASUREMENT; ANNIHILATION; DETECTOR; LIFETIME; MESONS010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyMESONSFísica nuclearHigh Energy Physics::ExperimentAstrophysics::Earth and Planetary AstrophysicsParticle Physics - ExperimentLepton

description

The semileptonic branching fractions for primary and cascade b decays BR(b -> lepton-), BR(b -> c -> lepton+) and BR(b -> cbar -> lepton-) were measured in hadronic Z decays collected by the DELPHI experiment at LEP. The sample was enriched in b decays using the lifetime information and various techniques were used to separate leptons from direct or cascade b decays. By fitting the momentum spectra of di-leptons in opposite jets, the average b mixing parameter chi-bar was also extracted. The following results have been obtained: BR(b -> lepton-) = (10.70 +/- 0.08 (stat) +/- 0.21 (syst)_{+0.44}^{-0.30}(model))% BR(b -> c -> lepton+) = (7.98 +/- 0.22 (stat) +/- 0.21 (syst)^{+0.14}_{-0.20}(model))% BR(b -> cbar -> lepton-) = (1.61 +/- 0.20 (stat) +/- 0.17 (syst)^{+0.30}_{-0.44}(model))% chi-bar = 0.127 +/- 0.013 (stat) +/- 0.005 (syst) +/- 0.004(model)

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