Home > Research > Publications & Outputs > Strange b baryon production and lifetime in Z d...
View graph of relations

Strange b baryon production and lifetime in Z decays

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
  • ALEPH Collaboration
Close
<mark>Journal publication date</mark>1996
<mark>Journal</mark>Physics Letters B
Issue number1-4
Volume384
Number of pages12
Pages (from-to)449-460
Publication StatusPublished
<mark>Original language</mark>English

Abstract

In a data sample of approximately four million hadronic Z decays recorded with the ALEPH detector from 1990 to 1995, a search for the strange b baryon Ξb is performed with a study of Ξ-lepton correlations. Forty-four events with same sign Ξ−ℓ− combinations are found whereas 8.4 are expected based on the rate of opposite sign Ξ−ℓ+ combinations. This significant excess is interpreted as evidence for Ξb semileptonic decays. The measured product branching ratio is per lepton species, averaged over electrons and muons, with Xc a charmed baryon. The Ξb lifetime is measured to be τΞb = 1.35−0.28+0.37(stat)−0.17+0.15(syst) ps.