The decays of Bs0 and anti-B0s mesons into the J/ψ K+ 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, ϕ_s, the decay width, Γ_s, and the width difference between light and heavy mass eigenstates, ΔΓ_s. A decay-time dependent amplitude analysis is employed. The data sample corresponds to an integrated luminosity of 3 fb^−1 produced in 7 and 8 TeV pp collisions at the LHC, collected by the LHCb experiment. The measurement determines ϕ_s = 119 ± 107 ± 34 mrad. A combination with previous LHCb measurements using similar decays into the J/ψ π+ π− and J/ψ ϕ(1020) final states gives ϕ_s = 1 ± 37 mrad, consistent with the Standard Model prediction.
Resonances and CP Violation in B0s and anti-B0s → J/ψ K+ K− Decays in the Mass Region Above the ϕ(1020)
Capriotti, L.;
2017
Abstract
The decays of Bs0 and anti-B0s mesons into the J/ψ K+ 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, ϕ_s, the decay width, Γ_s, and the width difference between light and heavy mass eigenstates, ΔΓ_s. A decay-time dependent amplitude analysis is employed. The data sample corresponds to an integrated luminosity of 3 fb^−1 produced in 7 and 8 TeV pp collisions at the LHC, collected by the LHCb experiment. The measurement determines ϕ_s = 119 ± 107 ± 34 mrad. A combination with previous LHCb measurements using similar decays into the J/ψ π+ π− and J/ψ ϕ(1020) final states gives ϕ_s = 1 ± 37 mrad, consistent with the Standard Model prediction.| File | Dimensione | Formato | |
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2017-AR-44-Resonances_and_CP_V_in_B0s_and_antiB0s_to_Jpsi_Kp_Km_Dec-JHEP.pdf
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