DETERMINING THE CP-VIOLATING PHASE-GAMMA

The weak phase-gamma is conventionally probed by the B(s) --> rho-0K(S) mode. The predicted rate is tiny. Even if a B(s) --> rho-K(s) rate difference could be established, it would not be clear that sin 2-gamma had been measured, because amplitudes with other weak phases may contribute significantly. Non-CP eigenstates, such as B(s) --> D(s)+/- K-/+, have a two-fold advantage over B(s) --> rho-0 K(s). Their rates are orders of magnitude above that for B(s) --> rho-0 K(s), and they probe the CP-violating phase-gamma, without any contamination from other weak phases. Detailed time-dependent studies of non-CP eigenstates remove possible final-state phases and extract the weak phase-gamma.