Observation of the annihilation decay mode $B^0\to K^{+}{K}^{-}$

LHCb collaboration, R. Aaij, B. Adeva +765

A search for the $B^0\to K^{+}{K}^{-}$ decay is performed using $pp$-collision data collected by LHCb. The data set corresponds to integrated luminosities of 1 and 2 fb${}^{-1}$ at c…