0000000000162471

AUTHOR

Ri Antonelli Antonella/c 6238 2011 Jones Roger/h 5578 2011 Passalacqua Luca/f 5127 2011 Murtas Fabrizio/b 5729 2012 O'shea Val/g 1279 2010

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Study of the fragmentation of b quarks into B mesons at the Z peak

2001

The fragmentation of b quarks into B mesons is studied with four million hadronic Z decays collected by the ALEPH experiment during the years 1991-1995. A semi-exclusive reconstruction of B->l nu D(*) decays is performed, by combining lepton candidates with fully reconstructed D(*) mesons while the neutrino energy is estimated from the missing energy of the event. The mean value of xewd, the energy of the weakly-decaying B meson normalised to the beam energy, is found to be mxewd = 0.716 +- 0.006 (stat) +- 0.006 (syst) using a model-independent method; the corresponding value for the energy of the leading B meson is mxel = 0.736 +- 0.006 (stat) +- 0.006 (syst). The reconstructed spectra …

QuarkNuclear and High Energy PhysicsParticle physicsMesonElectron–positron annihilationNuclear TheoryHadronFOS: Physical sciences7. Clean energy01 natural sciencesHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]B mesonNuclear Experiment010306 general physicsALEPH experimentPhysicsMissing energy010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyHigh Energy Physics::ExperimentParticle Physics - ExperimentLeptonPhysics Letters B
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