Inclusive pi(+/-), K+/- and (p,(p)over-bar) production is investigated using data recorded by the ALEPH detector 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)overbar, d(d)overbar, s(s)overbar decays. The number of protons found in b-hadron decays is used to estimate the fraction of b-baryons in 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(nu)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.

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

G. Batignani;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;MESSINEO, ALBERTO MARIA;TONELLI, GUIDO EMILIO;
1998-01-01

Abstract

Inclusive pi(+/-), K+/- and (p,(p)over-bar) production is investigated using data recorded by the ALEPH detector 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)overbar, d(d)overbar, s(s)overbar decays. The number of protons found in b-hadron decays is used to estimate the fraction of b-baryons in 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(nu)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.
1998
Barate, R.; Buskulic, D.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J. P.; Lucotte, A.; Minard, M. N.; Nief, J. Y.; Pietrzyk, B.; Boix, G.; Casado, M. P.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828888
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