Probing $c\to u\gamma$ in $B_c\to B_u^{\ast }\gamma$ decay

S. Prelovsek, S. Fajfer, P. Singer

Flavour changing neutral current (FCNC) transitions $c\to u\gamma$ and $c\to u{l}^{+}{l}^{-}$ are very rare in the standard model and present an interesting probe for the physics beyond it. We…