Study of B0 s → J/ψπ+π −K+K− decays
The decays B 0 s → 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 B 0 s → J/ψK∗0K∗0 and B 0 s → χc1(3872)K+K−, where the K+K− pair d...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universitat Ramon Llull (URL) |
| Repositorio: | DAU Arxiu Digital de la Universitat Ramon Llull |
| OAI Identifier: | oai:dau.url.edu:20.500.14342/3489 |
| Acceso en línea: | http://hdl.handle.net/20.500.14342/3489 https://doi.org/10.1007/JHEP02(2021)024 |
| Access Level: | acceso abierto |
| Palabra clave: | Gran col·lisionador d'hadrons (França i Suïssa) Quarks Interaccions d'hadrons 539 |
| Sumario: | The decays B 0 s → 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 B 0 s → J/ψK∗0K∗0 and B 0 s → 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 ± 6 MeV/c2 , ΓX(4740) = 53 ± 15 ± 11 MeV , where the first uncertainty is statistical and the second is systematic. In addition, the most precise single measurement of the mass of the B 0 s meson is performed and gives a value of mB0 s = 5366.98 ± 0.07 ± 0.13 MeV/c2 . |
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