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oai:recercat.cat:2445/1854962025-12-05T16:50:05Zcom_2072_1057col_2072_478823col_2072_478917

urn:hdl:2445/185496 Study of Bs0 → J/ψπ+π−K+K− decays Alfonso Albero, Alejandro García Moreno, Paula Garrido Beltrán, Lluís Gironella Gironell, P. Gomez Fernandez, S. Graugés Pous, Eugeni Lobo Salvia, A. Mauricio, J. Vazquez Gomez, R. Marin Benito, Carla LHCb Collaboration Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments 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 2022-05-10T15:39:10Z 2022-05-10T15:39:10Z 2021 2022-05-10T15:39:11Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1007/JHEP02(2021)024 Journal of High Energy Physics, 2021, vol. 2021, p. 1-34 https://doi.org/10.1007/JHEP02(2021)024 cc-by (c) Alfonso Albero, Alejandro et al., 2021 https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)