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

  • P. Abreu et al.
  • The DELPHI Collaboration
Experimental physics


The semileptonic branching fractions for primary and cascade b decays \({\mathrm{BR}}(b\rightarrow \ell^-)\), \(\mathrm{BR}(b\rightarrow c\rightarrow \ell^+)\) and \(\mathrm{BR}(b\rightarrow\bar c\rightarrow \ell^-\) 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 \(\bar{\chi}\) was also extracted. The following results have been obtained:



Momentum Spectrum Lifetime Information DELPHI Experiment 
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Copyright information

© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica 2001

Authors and Affiliations

  • P. Abreu et al.
    • 1
  • The DELPHI Collaboration
  1. 1.LIP, IST, FCUL - Av. Elias Garcia, 14-1°, 1000 Lisboa Codex, Portugal PT

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