A Novel Possibility to Determine the CP-violating Phase \gamma and the B^0_s-\bar{B}^0_s Mixing Parameter y_s at the \Upsilon (5S) Resonance

Abstract

We show that a CP-violating phase can be model-independently determined from the time-independent measurement of coherent B^0_s\bar{B}^0_s decays into (D^{(*)\pm}_s K^{(*)\mp})(D^{(*)\pm}_s K^{(*)\mp}) states at the \Upsilon (5S) resonance. This phase amounts to (-\gamma) within the standard model, where \gamma is the well-known angle of the quark mixing unitarity triangle. It is also possible to determine or constrain the B^0_s-\bar{B}^0_s mixing parameter y_s from the same measurement.