The decay Ξb− → Λb0 π− is observed using a proton-proton collision data sample collected at center-of-mass energy √s = 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 5.5 fb^−1. This process is mediated by the s → u anti-u d quark-level transition, where the b quark in the Ξb− baryon is a spectator in the decay. Averaging the results obtained using the two Λb0 decay modes, Λb0 → Λc+ π− and Λb0 → Λc+ π− π+ π−, the relative production ratio is measured to be (f_Ξb−/f_Λb0) B(Ξb− → Λb0 π−) = (7.3 ± 0.8 ± 0.6) × 10^−4. Here the uncertainties are statistical and systematic, respectively, and f_Ξb− (f_Λb0) is the fragmentation fraction for a b quark into a Ξb− (Λb0) baryon. Using an independent measurement of f_Ξb−/f_Λb0, the branching fraction B(Ξb− → Λb0 π−) = (0.89 ± 0.10 ± 0.07 ± 0.29)% is obtained, where the last uncertainty is due to the assumed SU(3) flavor symmetry in the determination of f_Ξb−/f_Λb0.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Observation and Branching Fraction Measurement of the Decay Ξb− → Λb0 π−. PHYSICAL REVIEW D, 108(7), 1-16 [10.1103/PhysRevD.108.072002].

Observation and Branching Fraction Measurement of the Decay Ξb− → Λb0 π−

Carbone, A.;Ferrari, F.;Galli, D.;Manuzzi, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zucchelli, S.;
2023

Abstract

The decay Ξb− → Λb0 π− is observed using a proton-proton collision data sample collected at center-of-mass energy √s = 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 5.5 fb^−1. This process is mediated by the s → u anti-u d quark-level transition, where the b quark in the Ξb− baryon is a spectator in the decay. Averaging the results obtained using the two Λb0 decay modes, Λb0 → Λc+ π− and Λb0 → Λc+ π− π+ π−, the relative production ratio is measured to be (f_Ξb−/f_Λb0) B(Ξb− → Λb0 π−) = (7.3 ± 0.8 ± 0.6) × 10^−4. Here the uncertainties are statistical and systematic, respectively, and f_Ξb− (f_Λb0) is the fragmentation fraction for a b quark into a Ξb− (Λb0) baryon. Using an independent measurement of f_Ξb−/f_Λb0, the branching fraction B(Ξb− → Λb0 π−) = (0.89 ± 0.10 ± 0.07 ± 0.29)% is obtained, where the last uncertainty is due to the assumed SU(3) flavor symmetry in the determination of f_Ξb−/f_Λb0.
2023
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Observation and Branching Fraction Measurement of the Decay Ξb− → Λb0 π−. PHYSICAL REVIEW D, 108(7), 1-16 [10.1103/PhysRevD.108.072002].
Aaij, R.; Abdelmotteleb, A.S.W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou, C...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/953553
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