First observation and measurement of the branching fraction for the decay $B_s^0\to D_s^{\ast \mp }{K}^{\pm }$

LHCb Collaboration, R. Aaij, B. Adeva +697

The first observation of the $B_s^0\to D_s^{\ast \mp }{K}^{\pm }$ decay is reported using 3.0$f{b}^{-1}$ of proton-proton collision data collected by the LHCb experiment. The $D_s^{\ast \mp }$…