A study of Lambda0b and Xi0b decays to Lambda h+⁡h'− (h(')=pi,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 Lambda0b -> Lambda+c⁡(->Lambda pi+)pi- decay as a control channel. The decays Lambda0𝑏 ->Lambda pi+⁢pi- and Xi0b ->Lambda K-pi+ 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 Lambda0b ->Lambda⁢ K+K- decay, interpreted as originating primarily from an asymmetric Lambda0b ->N*+K- decay amplitude. The measured CP asymmetries for other decays are compatible with zero.

Study of Lambda0b and Xi0b Decays to Lambda h+h′- and Evidence for CP Violation in Lambda0b ->Lambda K+K- Decays

Bassi G.
Membro del Collaboration Group
;
Kleijne N.
Membro del Collaboration Group
;
Morello M. J.
Membro del Collaboration Group
;
Passaro D.
Membro del Collaboration Group
;
Pica L.
Membro del Collaboration Group
;
Riccardi D.
Membro del Collaboration Group
;
2025

Abstract

A study of Lambda0b and Xi0b decays to Lambda h+⁡h'− (h(')=pi,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 Lambda0b -> Lambda+c⁡(->Lambda pi+)pi- decay as a control channel. The decays Lambda0𝑏 ->Lambda pi+⁢pi- and Xi0b ->Lambda K-pi+ 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 Lambda0b ->Lambda⁢ K+K- decay, interpreted as originating primarily from an asymmetric Lambda0b ->N*+K- decay amplitude. The measured CP asymmetries for other decays are compatible with zero.
Study of Λb0 and Ξb0 Decays to Λh+h′- and Evidence for CP Violation in Λb0 → Λk+K- Decays
2025
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Branching fraction; Bottom baryons; Bottom quark; CP violation
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/159984
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