2001/06/13 by ALEPH Collaboration, A. Heister, S. Schael +98 · 6 citations
Physics and Astronomy · #Aleph #B meson #Electron #Fragmentation (computing) #Hadron #High-Energy Particle Collisions Research #Lepton #Meson #Neutrino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quark #Spectral line #hep-ex
paper · pdf · doi:10.1016/s0370-2693(01)00690-6
published as Phys.Lett.B512:30-48,2001 · 21 pages, 5 figures
arxiv created 2001/06/13 · openalex publication_date 2001/07/01 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
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.