Small amplitude effects in $B^0\to D^{+}{D}^{-}$ and related decays

Michael Gronau, Jonathan L. Rosner, Dan Pirjol

Intrigued by a recent Belle result for a large direct CP asymmetry in $B^0\to D^{+}{D}^{-}$, we study the effects of a $\bar{b}\to \bar{u}u\bar{d}$ quark transition by combining the asymmet…