In the factorization model $D_s^{+}$→ω${\pi }^{+}$ is forbidden due to the absence of a spectator term, conserved vector current, and the absence of second-class axial-vector currents. We show that B($D_s^{+}$→ω${\pi }^{+}$) up to 3% can nevertheless be generated by final-state interactions. Hence a large (≊3%) branching ratio for $D_s^{+}$→ω${\pi }^{+}$ may not necessarily be a signal for the annihilation mechanism in this decay mode.

• Received 3 January 1989

DOI:https://doi.org/10.1103/PhysRevD.39.3503