A measurement of the semileptonic branching ratio BR(b-baryon -> pl(nu)over-bar X) and a study of inclusive pi(+/-), K(+/-), (p,(p)over-bar) production in Z decays
1998
Inclusive pi(+/-), K+/- and (p,(p)
over-
bar)
productionis investigated using data recorded by the
ALEPHdetector between 1992 and 1994. The momentum spectra and multiplicities are measured separately in Z --> b(b)
over-bar, Z --> c(c)
over-bar and Z --> u(u)
over-bar, d(d)
over-bar; s(s)
over-bar decays. The number of protons found in b-hadron decays is used to estimate the fraction of b-
baryonsin b events to be (10.2 +/- 0.7 +/- 2.7)% assuming BR(b-
baryon--> pX) = (58 +/- 6)%. From an additional study of proton-lepton correlations in b events, the branching ratio BR(b-
baryon--> pl(v)
over-bar-X) = (4.63 +/- 0.72 +/- 0.98)% is obtained. The ratio BR(b-
baryon--> pl(nu)
over-bar-X)/BR(b-
baryon--> pX) is found to be 0.080 +/- 0.012 +/- 0.014.
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Correction
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