Dynamics of strong and radiative decays of D_s-mesons in the hadrogenesis conjecture

Abstract：

The positive parity scalar D_s0^*(2317) and axial-vector D_s1^*(2460) charmed strange mesons are gene-rated by coupled-channel dynamics through thes-wave scattering of Goldstone bosons off the pseudoscalar and vector D(D_s)-meson ground states. The specific masses of these states are obtained as a consequence of the attraction arising from the Weinberg-Tomozawa interaction in the chiral Lagrangian. Chiral corrections to orderQ_χ²are calculated and found to be small. The D_s0^*(2317) and D_s1^*(2460) mesons decay either strongly into the isospin-violating π⁰D_sand π⁰D_s^*channels or electromagnetically. We show that the π⁰-η and (K⁰D⁺-K⁺D⁰) mixings act constructively to generate strong widths of the order of 140 keV and emphasize the sensitivity of this value to the KD component of the states. The one-loop contribution to the radiative decay amplitudes of scalar and axial-vector states is calculated using the electromagnetic Lagrangian to chiral orderQχ². We show the importance of taking into account processes involving light vector mesons explicitly in the dynamics of electromagnetic decays. The radiative width are sensitive to both ηD_sand KD components, hence providing information complementary to the strong widths on the positive parity D_s-meson structure.