Radiative and isospin-violating decays of image-mesons in the hadrogenesis conjecture Original Research Article

The masses and decays of the scalar View the MathML source(2317) and axial-vector View the MathML source charmed strange mesons are calculated consistently in the hadrogenesis conjecture. These mesons decay either strongly into the isospin-violating π0Ds and View the MathML source channels or electromagnetically. They are generated by coupled-channel dynamics based on the leading order chiral Lagrangian. The effect of chiral corrections to chiral order View the MathML source is investigated. We show that taking into account large-Nc relations to determine the strength of these correction terms implies a measurable signal for an exotic axial-vector state in the ηD∗ invariant mass distribution. The one-loop contribution to the electromagnetic decay amplitudes of scalar and axial-vector states is calculated. The Lagrangian describing electromagnetic interactions is obtained by gauging the chiral Lagrangian for hadronic interactions and adding gauge-invariant correction terms to chiral order View the MathML source. In addition the role of light vector meson degrees of freedom is explored. We confront our results with measured branching ratios. Once the light vector mesons are included, a natural explanation of all radiative decay parameters is achieved.