Search for the resonance-enhanced CP and angular asymmetries in the Λ_c^+→pμ^+ μ^- decay at LHCb
The first measurement of the CP asymmetry of the decay rate (A_CP) and the CP average (Sigma A_FB) and CP asymmetry (Delta A_FB) of the forward-backward asymmetry in the muon system of Λ_c^+ -> pμ^+ μ^- decays is reported. The measurement is performed using a data sample of proton-proton collisio...
| Authors: | , , , |
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| Format: | article |
| Publication Date: | 2025 |
| Country: | España |
| Institution: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repository: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:20.500.14342/6022 |
| Online Access: | http://hdl.handle.net/20.500.14342/6022 https://doi.org/10.1103/PhysRevD.111.L091102 |
| Access Level: | Open access |
| Keyword: | Flavor changing neutral currents Rare decays Charmed baryons CP symmetry P-symmetry Gran col·lisionador d'hadrons (França i Suïssa) 530.1 539 |
| Summary: | The first measurement of the CP asymmetry of the decay rate (A_CP) and the CP average (Sigma A_FB) and CP asymmetry (Delta A_FB) of the forward-backward asymmetry in the muon system of Λ_c^+ -> pμ^+ μ^- decays is reported. The measurement is performed using a data sample of proton-proton collisions, recorded by the LHCb experiment from 2016 to 2018 at a center-of-mass energy of 13 TeV, which corresponds to an integrated luminosity of 5.4 fb^-1. The asymmetries are measured in two regions of dimuon mass near the phi-meson mass peak. The dimuon-mass integrated results are: A_CP = (-1.1 ± 4.0 ± 0.5)% Sigma A_FB = (3.9 ± 4.0 ± 0.6)% Delta A_FB = (3.1 ± 4.0 ± 0.4)% where the first uncertainty is statistical and the second systematic. The results are consistent with the conservation of CP symmetry and the Standard Model expectations. |
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