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Study of Λb0 and Ξb0 Decays to Λh+h′− and Evidence for CP Violation in Λb0→ΛK+K− Decays

De Angelis, C.;Dettori, F.;Fabiano, F.;Manca, G.;Oldeman, R.;Provenzano, D.;Saitta, B.;
2025-01-01

Abstract

A study of Λ0 b and Ξ0 b decays to Λhþh0− (hð0Þ ¼ π; K) is performed using pp collision data collected by the LHCb experiment during LHC Runs 1–2, corresponding to an integrated luminosity of 9 fb−1. The branching fractions for these decays are measured using the Λ0 b → Λþ c ð→ ΛπþÞπ− decay as a control channel. The decays Λ0 b → Λπþπ− and Ξ0 b → ΛK−πþ are observed for the first time. For decay modes with sufficient signal yields, CP asymmetries are measured in the full and localized regions of the final-state phase space. Evidence is found for CP violation in the Λ0 b → ΛKþK− decay, interpreted as originating primarily from an asymmetric Λ0 b → NþK− decay amplitude. The measured CP asymmetries for other decays are compatible with zero.
2025
Inglese
134
10
Esperti anonimi
scientifica
Aaij, R.; Abdelmotteleb, A.  s.  w.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  a.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop ...espandi
1.1 Articolo in rivista
info:eu-repo/semantics/article
1 Contributo su Rivista::1.1 Articolo in rivista
262
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