Observation of the Isospin-Violating Decay $D_s^{\ast +}\to D_s^{+}{\pi }^0$

CLEO Collaboration, J. Gronberg et al

Using data collected with the CLEO~II detector, we have observed the isospin-violating decay $D_s^{\ast +}\to D_s^{+}{\pi }^0$. The decay rate for this mode, relative to the dominant radiativ…