Prospects for Direct CP Violaton in Exclusive and Inclusive Charmless B decays

Abstract

Within the Standard Model, CP rate asymmetries for $B\to K^{-}{\pi }^{+,0}$ could reach 10%. With strong final state phases, they could go up to 20--30%, even for ${\bar{K}}^0{\pi }^{-}$ mode which would have opposite sign. We can account for $K^{-}{\pi }^{+}$, ${\bar{K}}^0{\pi }^{-}$ and $\varphi K$ rate data with new physics enhanced color dipole coupling and destructive interference. Asymmetries could reach 40--60% for $K\pi$ and $\varphi K$ modes and are all of the same sign. We are unable to account for $K^{-}{\pi }^0$ rate. Our inclusive study supports our exclusive results.

Comments: Minor changes, correct a small bug in Fig. 1(b). Version to appear in Phys. Rev. Lett