Measurement of the semileptonic branching fraction of inclusive b baryon decays to Λ

The OPAL Collaboration

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8 Scopus citations

Abstract

We present the first measurement of the ratio RΛℓ defined as RΛℓ = BR(Λb → ΛℓX)/BR(Λb → ΛX) where Λb denotes all weakly decaying b baryons and ℓ represents the average of electrons and muons. Using all hadronic Z0 decay events collected with the OPAL detector near the Z0 resonance, we measure RΛℓ; = (7.0 ± 1.2 ± 0.7)%. We also measure f(b → Λb) · BR(Λb → ΛX) = (3.93 ± 0.46 ± 0.37)%, f(b → B) · BR(B → ΛX) = (1.94 ± 0.28 ± 0.24)%, and BR(b → ΛX) = (5.87 ± 0.46 ± 0.48)%. In all cases, the uncertainties shown are statistical and systematic, respectively.

Original languageEnglish
Pages (from-to)423-435
Number of pages13
JournalZeitschrift fur Physik C-Particles and Fields
Volume74
Issue number3
DOIs
StatePublished - 1 Jan 1997
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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