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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. 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T. H. Davies, G. C. Donald, G. P. Lepage, J. Koponen","submitted_at":"2013-12-18T19:11:12Z","abstract_excerpt":"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. 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