Study of Λb0 and Ξb0 Decays to Λh+h′- and Evidence for CP Violation in Λb0 → Λk+K- Decays
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 channe...
| Authors: | ; ; ; |
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| Format: | Article |
| Publication date: | 2024 |
| Country: | España |
| Institution: | Universitat Ramon Llull (URL) |
| Repository: | DAU Arxiu Digital de la Universitat Ramon Llull |
| OAI Identifier: | oai:dau.url.edu:20.500.14342/5818 |
| Online Access: | http://hdl.handle.net/20.500.14342/5818 https://doi.org/10.1103/PhysRevLett.134.101802 |
| Access Level: | Open access |
| Keyword: | Branching fraction Bottom bayrons Bottom quark CP violation Gran col·lisionador d'hadrons (França i Suïssa) 53 530.1 539 |
| Summary: | 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. |
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