Semi-inclusive hadronicBdecays in the endpoint region

Abstract

We consider in the soft-collinear effective theory semi-inclusive hadronic $B$ decays, $B\ensuremath{\rightarrow}XM$, in which an energetic light meson $M$ near the endpoint recoils against an inclusive jet $X$. We focus on a subset of decays where the spectator quark from the $B$ meson ends up in the jet. The branching ratios and direct $CP$ asymmetries are computed to next-to-leading order accuracy in ${\ensuremath{\alpha}}_{s}$ and to leading order in $1/{m}_{b}$. The contribution of charming penguins is extensively discussed, and a method to extract it in semi-inclusive decays is suggested. Subleading $1/{m}_{b}$ corrections and $SU(3)$ breaking effects are discussed.