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Radiative and isospin-violating decays of Ds mesons in the hadrogenesis conjecture
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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.
Forward citations
Cited by 5 Pith papers
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Properties of the $D_{s0}^*(2317)^\pm$ in hot and dense nuclear matter
A coupled-channel molecular model predicts that in nuclear matter the D_s0*(2317)+ shifts downward and broadens with density, while temperature narrows it and broadens its antiparticle, yielding a possible structural test.
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The $B^{+(0)} \to \bar D^{0(-)} D^{*}_{s0}(2317)^+$ decays and the molecular structure of $D^*_{s0}(2317)$
Using B→D D K data and a two-parameter model, the authors derive B→D D*_s0(2317) branching fractions that agree with experiment within errors, supporting a sizable DK molecular component of D*_s0(2317).
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What can we learn from the radiative decays of the $D_{s1}(2460)$ meson?
Measuring the ratio of radiative decay branching fractions from Ds1(2460) can probe the nature of Ds0*(2317) and Ds1(2460) mesons.
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Determining the width of $D_{s0}^{*}(2317)$ by using $T_{c\bar{s}0}^{a}(2327)$ in a molecular frame
Calibrating the DK molecular model on the newly measured Tcs0(2327) width predicts the Ds0*(2317) width to be 63 to 209 keV.
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Radiative decays of hadronic molecules: From confusion to inspiration
Radiative decays of hadronic molecules require careful treatment of scale hierarchies to resolve interpretive confusions, as demonstrated by reviewing decay types and instructive examples.
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