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Observation of the Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="italic">D</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">s</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow><mml:mi /><mml:mo>→</mml:mo><mml:mi /><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">ω</mml:mi><mml:mi mathvariant="italic">π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:…
Using ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data collected by the CLEO II detector at CESR, we have observed the decay ${D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{+}$. This final state may be produced through the annihilation decay of the ${D}_{s}^{+}$, or through final state interactions. We find a branching ratio of $\ensuremath{\gamma}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{+})/\ensuremath{\gamma}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\pi}}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.16\ifmmode\pm\else\textpm\fi{}0.04\ifmmode\pm\else\textpm\fi{}0.03$, where the first error is statistical and …