In 450 000 hadronic Z decays recorded with the ALEPH detector at LEP, the yields of Ds -ℓ+ and Λc +ℓ- combinations have been measured. 16.0 ± 4.3 Ds -ℓ+ combinations were observed in the Ds - → ππ- channel and 17.0 ± 4.5 combinations were observed in the Ds - → K*0K- channel. 21.0 ± 5.0 Λc +ℓ- combinations were observed, with the Λc + reconstructed in the decay mode Λc + → pK-π+. These events provide evidence for the decays Bs → Ds -Xℓ+ν and Λb → Λc +Xℓ-ν. Assuming that the Bs and Λb semileptonic decays are dominantly three-body, these observed yields, after background subtraction, translate into the following product branching ratios: Br(b → Bs)Br(Bs → Ds -Xℓ+ν) = 0.040±0.011 -0.012 +0.010, Br(b → Λb)Br(Λb → Λc +Xℓ-ν) = 0.030±0.007±0.009.

Buskulic, D., Decamp, D., Goy, C., Lees, J., Minard, M., Mours, B., et al. (1992). Observation of the semileptonic decays of BS and Λb hadrons at LEP. PHYSICS LETTERS. SECTION B, 294(1), 145-156 [10.1016/0370-2693(92)91654-R].

Observation of the semileptonic decays of BS and Λb hadrons at LEP

CARPINELLI, Massimo;
1992

Abstract

In 450 000 hadronic Z decays recorded with the ALEPH detector at LEP, the yields of Ds -ℓ+ and Λc +ℓ- combinations have been measured. 16.0 ± 4.3 Ds -ℓ+ combinations were observed in the Ds - → ππ- channel and 17.0 ± 4.5 combinations were observed in the Ds - → K*0K- channel. 21.0 ± 5.0 Λc +ℓ- combinations were observed, with the Λc + reconstructed in the decay mode Λc + → pK-π+. These events provide evidence for the decays Bs → Ds -Xℓ+ν and Λb → Λc +Xℓ-ν. Assuming that the Bs and Λb semileptonic decays are dominantly three-body, these observed yields, after background subtraction, translate into the following product branching ratios: Br(b → Bs)Br(Bs → Ds -Xℓ+ν) = 0.040±0.011 -0.012 +0.010, Br(b → Λb)Br(Λb → Λc +Xℓ-ν) = 0.030±0.007±0.009.
Articolo in rivista - Articolo scientifico
DS-MESONS; PARTICLE; BEAUTY; ALEPH;
English
145
156
12
Buskulic, D., Decamp, D., Goy, C., Lees, J., Minard, M., Mours, B., et al. (1992). Observation of the semileptonic decays of BS and Λb hadrons at LEP. PHYSICS LETTERS. SECTION B, 294(1), 145-156 [10.1016/0370-2693(92)91654-R].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390429
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