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

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

2001-06-13

arxiv.org/abs/hep-ex/0106051v1

Phys.Lett.B512:30-48,2001

Physics

High Energy Physics

High Energy Physics - Experiment

21 pages, 5 figures

Scientific paper

10.1016/S0370-2693(01)00690-6

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 are compared with different fragmentation models.

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