Resonances and CP violation in B s 0 and B ¯ s 0 → J / ψ K + K − $$ {\overline{B}}_s^0\to J/\psi {K}^{+}{K}^{-} $$ decays in the mass region above the ϕ(1020)

Abstract

The decays of B 0 s and B 0 s mesons into the J/K + K -final state are studied in the K + K -mass region above the (1020) meson in order to determine the resonant substructure and measure the CP -violating phase, s , the decay width, s , and the width difference between light and heavy mass eigenstates, 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 s = 119 107 34 mrad. A combination with previous LHCb measurements using similar decays into the J/ + -and J/(1020) final states gives s = 1 37 mrad, consistent with the Standard Model prediction.