We have studied the production of prompt muons in hadronic events from e +e-annihilation at a center-of-mass energy of 29 GeV with the PEP4-TPC (Time Projection Chamber) detector. The muon p and p, distributions arc well described by a combination of bottom- and charm-quark de-cays, with fitted semimuonic branching fractions of (15.2±1.9±1.2)% and (6.9±1.1±1.1)%, respectively. The muon spectra imply hard fragmentation functions for both b and c quarks, with <zib quark)) =0.80±0.05±0.05 and <z(c quark)) =0.60±0.06±0.c4. We derive neutral-current axial-vector couplings of a(b quark)= -0.9± 1.1±0.3 and a(c quark)= 1.5±1.5±0.5 from the forward-backward asymmetries.
ASJC Scopus subject areas
- Nuclear and High Energy Physics