Determination of the CP Phase $γ$ with Possibility of New Physics

We propose a new method to extract the CP violating weak phase $γ$ in the CKM paradigm of the Standard Model, using $B^- \to D^0 π^- \to f π^-$ and $B^- \to \bar D^0 π^- \to f π^-$ decays, where $f$ are final states such as $K^+ π^-$, $K^+ ρ^-$, $K ππ$, {\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 $γ$, and find that it would be in principle possible to identify $γ$ and a new phase angle $θ$ separately.

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