Regular Article – Theoretical Physics
Radiative three-body D-meson decays in and beyond the standard model
Fakultät Physik, TU Dortmund, Otto-Hahn-Str. 4, 44221, Dortmund, Germany
2 Department of Physics, University of Cincinnati, 45221, Cincinnati, OH, USA
Accepted: 1 January 2021
Published online: 18 January 2021
We study radiative charm decays , in QCD factorization at leading order and within heavy hadron chiral perturbation theory. Branching ratios including resonance contributions are around for the Cabibbo-favored modes into and for the singly Cabibbo-suppressed modes into , and thus in reach of the flavor factories BES III and Belle II. Dalitz plots and forward–backward asymmetries reveal significant differences between the two QCD frameworks; such observables are therefore ideally suited for a data-driven identification of relevant decay mechanisms in the standard-model dominated decays. This increases the potential to probe new physics with the and decays, which are sensitive to enhanced dipole operators. CP asymmetries are useful to test the SM and look for new physics in neutral transitions. Cuts in the Dalitz plot enhance the sensitivity to new physics due to the presence of both s- and t, u-channel intermediate resonances.
© The Author(s) 2021
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