Measurements of the $C\!P$-violating phase $\phi_{s}$ at LHCb

Abstract

The measurement of the mixing-induced $C\!P$-violating phase $\phi_{s}$ in the $B^{0}_{s}-\bar{B}^{0}_{s}$ system is one of the key goals of the LHCb experiment. It has been measured at the LHCb collaboration exploiting the Run~I data set and using several decay channels. In particular, the most recent Run~I result has been obtained analyzing $B^{0}_{s}\to J/\psi K^{+}K^{-}$ candidates in the mass region above the $\phi(1020)$ resonance. Despite the large improvements in the sensitivity of $\phi_{s}$ during the last decade, the precision is still limited by the available statistics