Subleading contributions to the width of the Ds0∗(2317)

We construct the effective chiral Lagrangian involving the D-mesons and Goldstone bosons at next-to-leading order taking into account strong as well as electromagnetic interactions. This allows us to disentangle-to leading order in isospin violation-the electromagnetic and the strong contribution to the D-meson mass differences. In addition, we also apply the interaction to the decay Ds0∗(2317)→Dsπ0 under the assumption that the Ds0∗(2317) is a hadronic molecule. We find (180±110) keV for the decay width Γ(Ds0∗(2317)→Dsπ0)-consistent with currently existing experimental constraints as well as previous theoretical investigations. The result provides further evidence that this decay width can serve as a criterion for testing the nature of the Ds0∗(2317).