Understanding $D_{sJ}(2317)$

We analyze the hadronic and radiative decay modes of the recently observed $D_{sJ}(2317)$ meson, in the hypothesis that it can be identifield with the scalar $s_{\mathrm{\ell }}^P={\frac{1}{2}}^{+}$ state of $c\bar{s}$ spectrum ($D_{s0}$). The method is based on heavy quark symmetries and Vector Meson Dominance ansatz. We find that the hadronic isospin violating mode $D_{s0}\to D_s{\pi }^0$ is enhanced with respect to the radiative mode $D_{s0}\to D_s^{\ast }\gamma$. The estimated width of the meson is $\mathrm{\Gamma }(D_{s0})\simeq 7$ KeV.