Lattice QCD on physical-pion-mass ensembles yields coupling constants g_D*+D+gamma = -0.204(22) GeV^-1, g_D*0D0gamma = 1.73(37) GeV^-1, and g_Ds*+Ds+gamma = -0.120(14) GeV^-1, with corresponding decay widths.
Prediction of the $D_s^*$ width from a calculation of its radiative decay in full lattice QCD
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abstract
We determine the rate for $D_s^* \rightarrow D_s \gamma$ for the first time from lattice QCD and include the full effect of $u$, $d$ and $s$ sea quarks. The valence quarks are implemented using the Highly Improved Staggered Quark (HISQ) formalism and we normalise the vector current nonperturbatively. We obtain $M(D_s^*)-M(D_s)$ of 148(4) MeV, in good agreement with experiment. The value of the decay constant of the $D_s^*$ we find to be 274(6) MeV, so that $f_{D_s^*}/f_{D_s} = 1.10(2)$. For the radiative decay we find $\Gamma(D_s^* \rightarrow D_s \gamma)$ = 0.066(26) keV. Given the experimental branching fraction for this decay we predict a total width for the $D_s^*$ of 0.070(28) keV, making this the longest lived charged vector meson.
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A review of BESIII charmed meson decay studies presents the most precise averages for |V_cs|, |V_cd|, D and D_s decay constants, and several hadronic form factors from combined experimental results.
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Radiative decay of heavy-light mesons from lattice QCD
Lattice QCD on physical-pion-mass ensembles yields coupling constants g_D*+D+gamma = -0.204(22) GeV^-1, g_D*0D0gamma = 1.73(37) GeV^-1, and g_Ds*+Ds+gamma = -0.120(14) GeV^-1, with corresponding decay widths.
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Review of experimental studies of charmed meson decays at BESIII
A review of BESIII charmed meson decay studies presents the most precise averages for |V_cs|, |V_cd|, D and D_s decay constants, and several hadronic form factors from combined experimental results.