The decays B0s → 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 B0s → J/ψK∗0K⎯⎯⎯⎯∗0 and B0s → 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 beX(4740)=4741±6±6MeV/2,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 B0s meson is performed and gives a value ofB0s=5366.98±0.07±0.13MeV/2.

Study of Bs0 → J/ψπ+π−K+K− decays / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2021:2(2021). [10.1007/JHEP02(2021)024]

Study of Bs0 → J/ψπ+π−K+K− decays

Capriotti, L.;Casse, G.;Sarti, A.;Sciubba, A.;
2021

Abstract

The decays B0s → 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 B0s → J/ψK∗0K⎯⎯⎯⎯∗0 and B0s → 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 beX(4740)=4741±6±6MeV/2,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 B0s meson is performed and gives a value ofB0s=5366.98±0.07±0.13MeV/2.
2021
Branching Ratios, Baryon measurements, Flavour Physics
01 Pubblicazione su rivista::01a Articolo in rivista
Study of Bs0 → J/ψπ+π−K+K− decays / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2021:2(2021). [10.1007/JHEP02(2021)024]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1580113
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