We calcuate the rate for $D_s^{*}\to D_s{\pi }^0$ decay using chiral perturbation theory. This isospin-violating process results from ${\pi }^0-\eta$ mixing, and its amplitude is proportional to $\frac{(m_d-m_u)}{\left[\frac{m_s-(m_u+m_d)}{2}\right]}$. Experimental information on the branching ratio for $D_s^{*}\to D_s{\pi }^0$ can provide insight into the pattern of SU(3) violation in radiative $D^{*}$ decays.

• Received 31 January 1994

DOI:https://doi.org/10.1103/PhysRevD.49.6228