Role of a charm factory in extracting CKM-phase information via B⃗DK

In this paper we study the impact of data that can be obtained from a charm factory on the determination of the Cabibbo-Kobayashi-Maskawa parameter γ from decays of the form B⃗D⁰K where the D⁰ decays to specific inclusive and exclusive final states. In particular, for each exclusive final state f, the charm factory can determine the strong phase difference between D⁰→f and D⁰→f by exploiting correlations in ψ(3770)→D⁰D⁰. This provides crucial input to the determination of γ via the interference of B^±→K^±D⁰→f with B^±→K^±D⁰→f. We discuss how the method may be generalized to inclusive final states and illustrate with a toy model how such methods may offer one of the best means to determine γ with O(10⁸–10⁹) B mesons.