Strong and radiative decays of theDs0*(2317)meson in theDK-molecule picture

We consider a possible interpretation of the new charm-strange meson $D_{s0}^{*}(2317)$ as a hadronic molecule—a bound state of $D$ and $K$ mesons. Using an effective Lagrangian approach, we calculate the strong $D_{s0}^{*}\to D_s{\pi }^0$ and radiative $D_{s0}^{*}\to D_s^{*}\gamma$ decays. A new impact related to the $DK$ molecular structure of the $D_{s0}^{*}(2317)$ meson is that the presence of $u(d)$ quarks in the $D$ and $K$ mesons gives rise to a direct strong isospin-violating transition $D_{s0}^{*}\to D_s{\pi }^0$ in addition to the decay mechanism induced by $\eta -{\pi }^0$ mixing considered previously. We show that the direct transition dominates over the $\eta -{\pi }^0$ mixing transition in the $D_{s0}^{*}\to D_s{\pi }^0$ decay. Our results for the partial decay widths are consistent with previous calculations.