Resonances and $CP$ violation in $B_s^0$ and ${\overline{B}}_s^0\to J/\psi K^{+}{K}^{-}$ decays in the mass region above the $\varphi (1020)$

Abstract

The decays of $B_s^0$ and ${\overline{B}}_s^0$ mesons into the $J/\psi K^{+}{K}^{-}$ final state are studied in the $K^{+}{K}^{-}$ mass region above the $\varphi (1020)$ meson in order to determine the resonant substructure and measure the $CP$-violating phase, ${\varphi }_s$, the decay width, ${\Gamma }_s$, and the width difference between light and heavy mass eigenstates, $\Delta {\Gamma }_s$. A decay-time dependent amplitude analysis is employed. The data sample corresponds to an integrated luminosity of $3{\mathrm{fb}}^{-1}$ produced in 7 and 8 Tev $pp$ collisions at the LHC, collected by the LHCb experiment. The measurement determines ${\varphi }_s=119\pm 107\pm 34\mathrm{mrad}$. A combination with previous LHCb measurements using similar decays into the $J/\psi {\pi }^{+}{\pi }^{-}$ and $J/\psi \varphi (1020)$ final states gives ${\varphi }_s=1\pm 37\mathrm{mrad}$, consistent with the Standard Model prediction.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-008.html

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