Abstract
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).
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