Observation and branching fraction measurement of the decay Ξb → Λ0bπ

LHCb Collaboration

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The decay Ξb → Λ0bπ is observed using a proton-proton collision data sample collected at center-of-ffiffi mass energy ps ¼ 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 5.5 fb−1. This process is mediated by the s → uūd quark-level transition, where the b quark in the Ξb baryon is a spectator in the decay. Averaging the results obtained using the two Λ0b decay modes, Λ0b → Λþc π and Λ0b → Λþc ππþπ, the relative production ratio is measured to be ðfΞb =fΛ0 bÞBðΞb → Λ0bπÞ ¼ ð7.3 ± 0.8 ± 0.6Þ × 10−4. Here the uncertainties are statistical and systematic, respectively, and fΞb ðfΛ0 bÞ is the fragmentation fraction for a b quark into a Ξb0b) baryon. Using an independent measurement of fΞb =fΛ0 b, the branching fraction BðΞb → Λ0bπÞ ¼ ð0.89 ± 0.10 ± 0.07 ± 0.29Þ% is obtained, where the last uncertainty is due to the assumed SU(3) flavor symmetry in the determination of fΞb =fΛ0 b,.

Idioma originalInglés
Número de artículo072002
PublicaciónPhysical Review D
EstadoPublicada - 1 oct 2023


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