The decays B0s → J/ψ π+ 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/ψ K*0 anti-K*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/ψ K*0 anti-K*0, ψ(2S) ϕ and χc1(3872) K+ K− states are reported. A structure, denoted as X(4740), is observed in the J/ψ ϕ mass spectrum and, assuming a Breit-Wigner parameterisation, its mass and width are determined to be m_X(4740) = 4741 ± 6 ± 6 MeV/c^2, Γ_X(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 B0s meson is performed and gives a value of m_B0s = 5366.98 ± 0.07 ± 0.13 MeV/c^2.

Study of B0s → J/ψ π+ π− K+ K− Decays

Capriotti, L.;
2021

Abstract

The decays B0s → J/ψ π+ 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/ψ K*0 anti-K*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/ψ K*0 anti-K*0, ψ(2S) ϕ and χc1(3872) K+ K− states are reported. A structure, denoted as X(4740), is observed in the J/ψ ϕ mass spectrum and, assuming a Breit-Wigner parameterisation, its mass and width are determined to be m_X(4740) = 4741 ± 6 ± 6 MeV/c^2, Γ_X(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 B0s meson is performed and gives a value of m_B0s = 5366.98 ± 0.07 ± 0.13 MeV/c^2.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3582722
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