The decays of Bs0 and B0s mesons into the J/ψK+K− final state are studied in the K+K− mass region above the φ(1020) meson in order to determine the resonant substructure and measure the CP-violating phase, φs, the decay width, Γs, and the width difference between light and heavy mass eigenstates, ∆Γs. A decay-time dependent am- plitude analysis is employed. The data sample corresponds to an integrated luminosity of 3fb−1 produced in 7 and 8TeV pp collisions at the LHC, collected by the LHCb ex- periment. The measurement determines φs = 119 ± 107 ± 34 mrad. A combination with previous LHCb measurements using similar decays into the J/ψπ+π− and J/ψφ(1020) final states gives φs = 1 ± 37 mrad, consistent with the Standard Model prediction
Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2017). Resonances and CP violation in Bs0 and B0s → J/ψK+K− decays in the mass region above the φ(1020). JOURNAL OF HIGH ENERGY PHYSICS, 2017(8) [10.1007/JHEP08(2017)037].
Resonances and CP violation in Bs0 and B0s → J/ψK+K− decays in the mass region above the φ(1020)
Belloli, N.;Borgheresi, A.;Borsato, M.;Calvi, M.;Carniti, P.;Cassina, L.;Fazzini, D.;Gotti, C.
;Grillo, L.;Martinelli, M.;Matteuzzi, C.;Petruzzo, M.;
2017
Abstract
The decays of Bs0 and B0s mesons into the J/ψK+K− final state are studied in the K+K− mass region above the φ(1020) meson in order to determine the resonant substructure and measure the CP-violating phase, φs, the decay width, Γs, and the width difference between light and heavy mass eigenstates, ∆Γs. A decay-time dependent am- plitude analysis is employed. The data sample corresponds to an integrated luminosity of 3fb−1 produced in 7 and 8TeV pp collisions at the LHC, collected by the LHCb ex- periment. The measurement determines φs = 119 ± 107 ± 34 mrad. A combination with previous LHCb measurements using similar decays into the J/ψπ+π− and J/ψφ(1020) final states gives φs = 1 ± 37 mrad, consistent with the Standard Model prediction
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