Determination of the mixing-induced $C\!P$-violating phase $\phi_{ s}$ and decay width difference $\Delta\Gamma_{ s}$ in $\bar{ b}\to\bar{ c}c\bar{ s}$ decays is one of the main goals of the LHCb experiment. Thanks to the precise prediction of the $\phi_{ s}$ value within the Standard Model, it represents an excellent probe to search for new physics. The measurements of $\phi_{ s}$ and $\Delta\Gamma_{ s}$ at LHCb are reviewed including results from the 3.0~fb$^{ -1}$ dataset accumulated during 2011-2012. Further measurement improvement is expected from the inclusion of results obtained using decay modes with smaller branching fraction.
Categories: hep-ex