Determination of the CP Phase $\gamma$ with Possibility of New Physics

Abstract

We propose a new method to extract the CP violating weak phase $\gamma$ in the CKM paradigm of the Standard Model, using $B^{-}\to D^0{\pi }^{-}\to f{\pi }^{-}$ and $B^{-}\to {\bar{D}}^0{\pi }^{-}\to f{\pi }^{-}$ decays, where $f$ are final states such as $K^{+}{\pi }^{-}$, $K^{+}{\rho }^{-}$, $K\pi \pi$, {\it etc.} We also study the experimental feasibility of our new method. With possibility of new phases in the CKM matrix, we re-examine some of the previously proposed methods to determine $\gamma$, and find that it would be in principle possible to identify $\gamma$ and a new phase angle $\theta$ separately.

Comments: 4 pages, LaTeX; Using two-column style file (ltwol.sty); To be published in the Proceedings of the Fourth International Workshop on B Physics and CP Violation, Ise-Shima, Japan, February 18 - 23, 2001