The decays B0s → J/ψπ+π−K+K− are studied using a data set corresponding to an integrated luminosity of 9fb−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 ob- served 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±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 of mB0s = 5366.98 ± 0.07 ± 0.13 MeV/c2 .

Study of B-s(0) -> J/psi pi(+)pi-K+K- decays

Bassi, G.
Membro del Collaboration Group
;
Lusiani, A.
Membro del Collaboration Group
;
Morello, M. J.
Membro del Collaboration Group
;
Pajero, T.
Membro del Collaboration Group
;
Pica, L.
Membro del Collaboration Group
;
Ribatti, R.
Membro del Collaboration Group
;
2021

Abstract

The decays B0s → J/ψπ+π−K+K− are studied using a data set corresponding to an integrated luminosity of 9fb−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 ob- served 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±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 of mB0s = 5366.98 ± 0.07 ± 0.13 MeV/c2 .
2021
Settore FIS/01 - Fisica Sperimentale
B physics, Branching fraction, Hadron-Hadron scattering (experiments), Quarkonium, Spectroscopy
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/112308
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