Observation of Λ0 b→ Λ+ c D(∗)0K− and Λ0 b→ Λ+ c D∗− s decays
The decays Λ0 b → Λ+ c D(∗)0K − and Λ0 b → Λ+ c D∗− s are observed for the first time, in proton-proton collision data at √s = 13TeV, corresponding to an integrated luminosity of 5.4fb−1 collected with the LHCb detector. Their ratios of branching fractions with respect to the Λ0 b → Λ+ c D− s mode a...
| Autores: | , , , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/221417 |
| Acceso en línea: | https://hdl.handle.net/2445/221417 |
| Access Level: | acceso abierto |
| Palabra clave: | Física de partícules Quarks Particle physics |
| Sumario: | The decays Λ0 b → Λ+ c D(∗)0K − and Λ0 b → Λ+ c D∗− s are observed for the first time, in proton-proton collision data at √s = 13TeV, corresponding to an integrated luminosity of 5.4fb−1 collected with the LHCb detector. Their ratios of branching fractions with respect to the Λ0 b → Λ+ c D− s mode are measured to be B Λ0 b→ Λ+ c D0K − B Λ0 b→ Λ+ c D− s = 0.1908+0.0036 −0.0034 +0.0016 −0.0018 ± 0.0038, B Λ0 b→ Λ+ c D∗0K − B Λ0 b→ Λ+ c D− s = 0.589+0.018 −0.017 +0.017 −0.018 ± 0.012, B Λ0 b→ Λ+ c D∗− s B Λ0 b→ Λ+ c D− s = 1.668 ± 0.022+0.061 −0.055, where the first uncertainties are statistical, the second systematic, and the third, for the Λ0 b → Λ+ c D(∗)0K − decays, are due to the uncertainties on the branching fractions of the D− s → K −K +π− and D0 → K +π− decay modes. The measured branching fractions probe factorization assumptions in effective theories and provide the normalization for future pentaquark searches in Λ0 b → Λ+ c D(∗)0K − decay channels. |
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