First observation of the Λ0b → Λ+ c D− s K+K− decay and search for pentaquarks in the Λ+ c D− s system
The Λ0 b → Λþc D−s KþK− decay is observed for the first time using the data sample from proton-proton collisions recorded at a center-of-mass energy of 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 6 fb−1. The ratio of branching fraction to that of Λ0 b → Λþc D−s decays...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:20.500.14342/5973 |
| Acceso en línea: | http://hdl.handle.net/20.500.14342/5973 https://doi.org/10.1103/b28d-z2xc |
| Access Level: | acceso abierto |
| Palabra clave: | Branching fraction Quantum chromodynamics Strong interaction Exotics bayrons Gran col·lisionador d'hadrons (França i Suïssa) 530.1 539 |
| Sumario: | The Λ0 b → Λþc D−s KþK− decay is observed for the first time using the data sample from proton-proton collisions recorded at a center-of-mass energy of 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 6 fb−1. The ratio of branching fraction to that of Λ0 b → Λþc D−s decays is measured as 0.0141 0.0019 0.0012, where the first uncertainty is statistical and the second systematic. A search for hidden-charm pentaquarks with strangeness is performed in the Λþc D−s system. No evidence is found, and upper limits on the production ratio of Pc¯csð4338Þ0 and Pc¯csð4459Þ0 pentaquarks relative to the Λþc D−s final state are set at the 95% confidence level as 0.12 and 0.20, respectively. |
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