Observation of the decay $B_s^0\to {\eta }_c\varphi$ and evidence for $B_s^0\to {\eta }_c{\pi }^{+}{\pi }^{-}$

LHCb collaboration, R. Aaij, B. Adeva +762

A study of $B_s^0\to {\eta }_c\varphi$ and $B_s^0\to {\eta }_c{\pi }^{+}{\pi }^{-}$ decays is performed using $pp$ collision data corresponding to an integrated luminosity of 3.0$\,\rm fb^{-1}…