A Determination of the Weak Phase \gamma from Color-allowed B^{\pm}_u \to DK^{\pm} Decays

Abstract

We show that it is possible to determine the weak phase \gamma \equiv \arg (- V^*_{ub} V_{ud} / V^*_{cb} V_{cd}) of the Cabibbo-Kobayashi-Maskawa flavor mixing matrix only from the measurement of the color-allowed B^{\pm}_u \to D K^{\pm} decay rates. The uncertainty of this method, arising mainly from the factorization approximation for two tree-level spectator quark transitions, may be well controlled.

Comments: 7 pages. Minor changes. Phys. Rev. D (in press)