Using approximately 4 million hadronic Ζ decays recorded with the ALEPH detector from 1991 through 1995, the lifetime of the b baryon is measured with three independent methods. From the impact parameter distribution of candidate leptons in 1063 events with Λℓ- combinations, the average b baryon lifetime is measured to be 1.20 ± 0.08 ± 0.06 ps. From a sample of 193 fully reconstructed Λ+c candidates correlated with a lepton and a sample of 46 Λℓ+ℓ- combinations, the Λb lifetime is measured to be 1.21 ± 0.11 ps. The product branching fractions to these final states are Br(b → Λbb) · Br(Λb → Λℓ-v̄X) = 0.326 ± 0.016 ± 0.039% for the first sample and Br(b → Λb) · Br(Λb → Λ+cℓ-v̄X) = 0.86 ± 0.07 ± 0.14% for the second and third samples combined.

Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, G., Lees, J., et al. (1998). Measuremént of the b baryon lifetime and branching fractions in Z decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 2(2), 197-211 [10.1007/s100520050133].

Measuremént of the b baryon lifetime and branching fractions in Z decays

CARPINELLI, Massimo;
1998

Abstract

Using approximately 4 million hadronic Ζ decays recorded with the ALEPH detector from 1991 through 1995, the lifetime of the b baryon is measured with three independent methods. From the impact parameter distribution of candidate leptons in 1063 events with Λℓ- combinations, the average b baryon lifetime is measured to be 1.20 ± 0.08 ± 0.06 ps. From a sample of 193 fully reconstructed Λ+c candidates correlated with a lepton and a sample of 46 Λℓ+ℓ- combinations, the Λb lifetime is measured to be 1.21 ± 0.11 ps. The product branching fractions to these final states are Br(b → Λbb) · Br(Λb → Λℓ-v̄X) = 0.326 ± 0.016 ± 0.039% for the first sample and Br(b → Λb) · Br(Λb → Λ+cℓ-v̄X) = 0.86 ± 0.07 ± 0.14% for the second and third samples combined.
Articolo in rivista - Articolo scientifico
Physics
English
1998
2
2
197
211
none
Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, G., Lees, J., et al. (1998). Measuremént of the b baryon lifetime and branching fractions in Z decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 2(2), 197-211 [10.1007/s100520050133].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390128
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