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

Abstract : 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00010978
Contributor : Claudine Bombar <>
Submitted on : Monday, July 23, 2001 - 11:19:03 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:05 PM
Long-term archiving on: : Tuesday, June 2, 2015 - 12:15:53 PM

### Identifiers

• HAL Id : in2p3-00010978, version 1

### Citation

A. Heister, S. Schael, R. Barate, I. de Bonis, D. Decamp, et al.. Study of the fragmentation of $b$ quarks into $B$ mesons at the $Z$ peak. Physics Letters B, Elsevier, 2001, 512, pp.30-48. ⟨in2p3-00010978⟩

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