What can we learn from $B\to$ $\rho (\omega )K$ decays?

Abstract

We show that in the PQCD approach the $B\to \rho (\omega )K$ decays display not only the dynamical penguin enhancement, the mechanism responsible for the large branching ratios (BRs) of $B\to \varphi K$ decays, but also the importance of annihilation contributions. We find that the CP asymmetries (CPAs) of $B\to {\rho }^{\pm }{K}^{\mp }$, $B^{\mp }\to {\rho }^0(\omega )K^{\mp }$ (class I) are all over 50%.

Comments: 10 pages, 1 figure, final version to appear in PLB