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Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays

par Abreu, Pedro;Bertrand, Daniel ; [et al.]
Référence European Physical Journal C. Particles and Fields, 20, page (455-478)
Publication Publié, 2001

Article révisé par les pairs

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Résumé :

The semileptonic branching fractions for primary and cascade b decays BR(b → l-), BR(b → c → l+) and BR(b → c̄ → l- 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 x̄ was also extracted. The following results have been obtained: (equation presented).