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 Br(b → Ξb) × Br(Ξb → ΧcΧℓ-νl) × Br(XΧc → Ξ-Χ′) = (5.4±1.1(stat)±0.8(syst)) × 10-4 per lepton species, averaged over electrons and muons, with Χc a charmed baryon. The Ξb lifetime is measured to be τΞb = 1.35-0.28+0.37 (stat) 0.17+0.15 (syst) ps.

Buskulic, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1996). Strange b baryon production and lifetime in Z decays. PHYSICS LETTERS. SECTION B, 384(1-4), 449-460 [10.1016/0370-2693(96)00925-2].

Strange b baryon production and lifetime in Z decays

CARPINELLI, Massimo;
1996

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 Br(b → Ξb) × Br(Ξb → ΧcΧℓ-νl) × Br(XΧc → Ξ-Χ′) = (5.4±1.1(stat)±0.8(syst)) × 10-4 per lepton species, averaged over electrons and muons, with Χc a charmed baryon. The Ξb lifetime is measured to be τΞb = 1.35-0.28+0.37 (stat) 0.17+0.15 (syst) ps.
Articolo in rivista - Articolo scientifico
Physics
English
1996
384
1-4
449
460
none
Buskulic, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1996). Strange b baryon production and lifetime in Z decays. PHYSICS LETTERS. SECTION B, 384(1-4), 449-460 [10.1016/0370-2693(96)00925-2].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390210
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