FCNC in Concurrent Dark Photon and Dark $Z$ Models

Lopamudra Mukherjee

In this work we fit the available binned data of the differential decay distribution of the exclusive $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$ and $B_s\to \varphi {\mu }^{+}{\mu }^{-}$ decays to the mass and mi…