Electromagnetic Dalitz decays of D(s)∗ mesons

Abstract

Rare electromagnetic (EM) decays of charmed mesons are useful laboratories to explore the structure of hadronic states and the interactions between photons and charmed mesons, to test the chiral perturbation theory in flavor sector and to search for new physics including dark photons. In this paper, we calculate the relative branching ratios of EM Dalitz decays [Formula: see text] to their corresponding radiative decays [Formula: see text] with transition form factor in vector-meson dominance model, where [Formula: see text] represents [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]. The corresponding dileptonic invariant mass spectra and the leptonic angular distributions are also presented.