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We present an improved calculation of the strong coupling constants$g_{D^*D\rho}$ and $g_{B^*B\rho}$ in light-cone sum rules including theone-loop QCD corrections of leading power with $\rho$ meson distributionamplitudes. We further compute the subleading-power corrections fromtwo-particle and three-particle higher-twist contributions at leading order upto twist-4 accuracy. The next-to leading order corrections to leading powercontribution offset the subleading-power corrections to some extendnumerically, and our numerical results are consistent with previous works fromsum rules. The comparisons between our results and the existing model-dependentestimations are also made.

$D^*D\rho$ and $B^*B\rho$ strong couplings in light-cone sum rules

$D^D\rho$ and $B^B\rho$ strong couplings in light-cone sum rules