Inclusive Electron Production ine+e−Annihilation at 29 GeV

The total momentum and transverse momentum spectra of electrons in $e^{+}{e}^{-}$ annihilation at 29 GeV have been measured. The inclusive cross section is determined to be 14.4±1.6±5.2 pb for momenta greater than 2 GeV/c. The average semielectronic branching ratios of charm and bottom quarks are measured to be (6.3±1.2±2.1)% and (11.6±2.1±1.7)%, respectively. The fragmentation function for bottom quarks is determined to be peaked at high $z$, with ${〈z〉}_b=0.75\mathrm{}\pm 0.05\pm 0.04$.