Theoretical prediction forD*→Ddecays

We have predicted that $B(D^{*+}\to D^{+}\gamma )$ is between 0.4% and 2% using data from the similar decays of $D^{*0\mathrm{}}$ and $D^{*0\mathrm{}}$ mesons. Our calculation is based on an effective field theory with expansions in external momentum and heavy-quark mass. We also have calculated the $K^{*}$ branching fractions and found reasonable agreement between theory and experiment. Our calculation suggests that nonleading terms in the quark-mass expansion may still be quite important for both $s$ and $c$ quarks.