Prompt electron production from the DELCO detector at the SLAC storage ring PEP

We report final results on prompt electron production in hadronic events from e+e- annihilations at √s =29 GeV, obtained with the DELCO detector at the SLAC storage ring PEP. We find the semielectronic branching ratios of charm and bottom quarks to be B(c→se+νe)=(11.6-0.9 +1.1)% and B(b→ce-ν¯e)=(14....
Ausführliche Beschreibung

We report final results on prompt electron production in hadronic events from e+e- annihilations at √s =29 GeV, obtained with the DELCO detector at the SLAC storage ring PEP. We find the semielectronic branching ratios of charm and bottom quarks to be B(c→se+νe)=(11.6-0.9 +1.1)% and B(b→ce-ν¯e)=(14.9-1.9 +2.2)% respectively. These results, from the complete data set, are consistent with an earlier analysis of partial data and indicate hard fragmentation functions for both c and b quarks, with mean values 〈zc〉=0.59±0.04 and 〈zb〉=0.72±0.05. The errors indicated here are a combination of statistical and systematic uncertainties. Ausführliche Beschreibung