Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays
(2001) European Physical Journal C. Particles and Fields — Vol. 20, p. 455-478 (2001)
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- Abstract
- he semileptonic branching fractions for 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 leptons from direct or cascade b decays. By fitting the momentum spectra of di-leptons in 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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Citations
Abreu, P., DELPHI Collaboration, Cortina Gil, E., & et al. (2001). Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays. European Physical Journal C. Particles and Fields, 20, 455-478. https://doi.org/10.1007/s100520100690 (Original work published 2001)