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. [The LHCb Collaboration]

Study of Λb0 and Ξb0 Decays to Λh+h′− and Evidence for CP Λb0→ΛK+K− Decays / R. Aaij, A. . .A.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 134:10(2025 Mar 12), pp. 101802.1-101802.16. [10.1103/physrevlett.134.101802]

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

S. Cesare;C. Mancuso;D. Marangotto;A. Merli;N. Neri;G. Tonani;Z. Wang;
2025

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. [The LHCb Collaboration]
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
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12-mar-2025
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1250676
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