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

LHCb Collaboration

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Abstract

A study of Λb0 and Ξb0 decays to Λh+h′- (h(′)=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 Λb0→Λc+(→Λπ+)π- decay as a control channel. The decays Λb0→Λπ+π- and Ξb0→ΛK-π+ 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 Λb0→ΛK+K- decay, interpreted as originating primarily from an asymmetric Λb0→N∗+K- decay amplitude. The measured CP asymmetries for other decays are compatible with zero.

Original languageEnglish
Article number101802
Pages (from-to)1-16
Number of pages16
JournalPhysical review letters
Volume134
Issue number10
Early online date12 Mar 2025
DOIs
Publication statusPublished - 14 Mar 2025

Bibliographical note

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© 2025 CERN.

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