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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185496
Study of Bs0 → J/ψπ+π−K+K− decays
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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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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. Study of Bs0 → J/ψπ+π−K+K− decays. _Journal of High Energy Physics_. 2021. Vol. 2021, núm. 1-34. [consulta: 20 de gener de 2026]. ISSN: 1126-6708. [Disponible a: https://hdl.handle.net/2445/185496]