ω-φ mixing and weak annihilation in Ds decays

The mixing between nonstrange and strange quark wave functions in the omega and phi mesons leads to a small predicted branching ratio B(D-s(+)->omega e(+)nu(e))=O(10(-4))(delta/3.34 degrees)(2), where delta is the mixing angle. The value delta=-3.34 degrees is obtained in a mass-independent analysis, while a mass-dependent analysis gives delta=-0.45 degrees at m(omega) and -4.64 degrees at m(phi). Measurement of this branching ratio thus can tell whether the decay is dominated by phi-omega mixing, or additional nonperturbative processes commonly known as weak annihilation (WA) contribute. The role of WA in the decay D-s(+)->omega pi(+) and its possible use in estimating WA effects in D-s(+)->omega e(+)nu(e) are also discussed. Assuming that the dynamics of WA in D-s(+)->omega pi(+) is similar in D-s(+)->omega e(+)nu(e) we estimate B(D-s(+)->omega e(+)nu(e))=(1.3 +/- 0.5)x10(-3).