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.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Study of B0s → J/ψ π+ π− K+ K− Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2021(2), 1-33 [10.1007/JHEP02(2021)024].

Study of B0s → J/ψ π+ π− K+ K− Decays

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Zucchelli, S.;
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.
2021
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Study of B0s → J/ψ π+ π− K+ K− Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2021(2), 1-33 [10.1007/JHEP02(2021)024].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/848618
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