Observation of the $B_s^0\to {\eta }^{\prime }{\eta }^{\prime }$ decay

LHCb collaboration, R. Aaij, B. Adeva +703

The first observation of the $B_s^0\to {\eta }^{\prime }{\eta }^{\prime }$ decay is reported. The study is based on a sample of proton-proton collisions corresponding to $3.0$ $\mathrm{f}{\mathrm{b}}^{-1}$ of integrated lumin…