Study of Bs0 → J/ψπ+π−K+K− decays
The decays Bs0 → J/ψπ+π−K+K− are studied using a data set corresponding to an integrated luminosity of 9 fb−1, collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The decays Bs0 → J / ψK∗ 0K ¯ ∗ 0 and Bs0 → χc1(3872)K+K−, where the K+K−pair doe...
| Autores: | , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/185496 |
| Acceso en línea: | https://hdl.handle.net/2445/185496 |
| Access Level: | acceso abierto |
| Palabra clave: | Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Large Hadron Collider (France and Switzerland) Particle physics |
| Sumario: | The decays Bs0 → J/ψπ+π−K+K− are studied using a data set corresponding to an integrated luminosity of 9 fb−1, collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The decays Bs0 → J / ψK∗ 0K ¯ ∗ 0 and Bs0 → χc1(3872)K+K−, where the K+K−pair does not originate from a ϕ meson, are observed for the first time. Precise measurements of the ratios of branching fractions between intermediate χc1(3872)ϕ, J / ψK∗ 0K ¯ ∗ 0, ψ(2S)ϕ and χc1(3872)K+K− states are reported. A structure, denoted as X(4740), is observed in the J/ψϕ mass spectrum and, assuming a Breit-Wigner parameterisation, its mass and width are determined to be mX(4740)=4741±6±6MeV/c2,ΓX(4740)=53±15±11MeV, where the first uncertainty is statistical and the second is systematic. In addition, the most precise single measurement of the mass of the Bs0 meson is performed and gives a value of mBs0=5366.98±0.07±0.13MeV/c2 |
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