Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays
2001
he semileptonic
branching fractionsfor primary and cascade b decays BR(b ->
lepton-), BR(b -> c ->
lepton+) and BR(b -> cbar ->
lepton-) were measured in hadronic Z decays collected by the DELPHI experiment at LEP. The sample was enriched in b decays using the lifetime information and various techniques were used to separate
leptonsfrom direct or cascade b decays. By fitting the momentum spectra of di-
leptonsin opposite jets, the average b mixing parameter chi-bar was also extracted. The following results have been obtained: BR(b ->
lepton-) = (10.70 +/- 0.08 (
stat) +/- 0.21 (syst)_{+0.44}^{-0.30}(model))% BR(b -> c ->
lepton+) = (7.98 +/- 0.22 (
stat) +/- 0.21 (syst)^{+0.14}_{-0.20}(model))% BR(b -> cbar ->
lepton-) = (1.61 +/- 0.20 (
stat) +/- 0.17 (syst)^{+0.30}_{-0.44}(model))% chi-bar = 0.127 +/- 0.013 (
stat) +/- 0.005 (syst) +/- 0.004(model)
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