Radiative and isospin-violating decays of Ds mesons in the hadrogenesis conjecture

TL;DR

This paper models the masses and decay processes of specific charmed strange mesons using the hadrogenesis conjecture, incorporating chiral corrections and vector mesons to match experimental data and predict exotic states.

Contribution

It provides a consistent theoretical framework for D_{s0}^*(2317) and D_{s1}^*(2460) mesons, including chiral and electromagnetic corrections, and predicts an exotic axial-vector state.

Findings

Successful description of meson masses and decay widths.

Prediction of a measurable exotic axial-vector state.

Enhanced understanding of radiative decay mechanisms.

Abstract

The masses and decays of the scalar D_{s0}^*(2317) and axial-vector D_{s1}^*(2460) charmed strange mesons are calculated consistently in the hadrogenesis conjecture. These mesons decay either strongly into the isospin-violating pi^0 D_s and pi^0 D_s^* 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 Q_\chi^2 is investigated. We show that taking into account large-N_c relations to determine the strength of these correction terms implies a measurable signal for an exotic axial-vector state in the eta D* 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 Q_chi^2. 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.