A novel possibility to determine the CP-violating phase γ and the B0s–B̄0s mixing parameter ys at the ϒ(5S) resonance

We show that a CP-violating phase can be model-independently determined from the time-independent measurement of coherent B0sB̄0s decays into (D(∗)±sK(∗)∓)(D(∗)±sK(∗)∓) states at the ϒ(5S) resonance. This phase amounts to (−γ) within the standard model, where γ is the well-known angle of the quark mixing unitarity triangle. It is also possible to determine or constrain the B0s–B̄0s mixing parameter ys from the same measurement.