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arXiv · 2001.05112

$D^*Dρ$ and $B^*Bρ$ strong couplings in light-cone sum rules

Chao Wang·Hua-dong Li
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Abstract

We present an improved calculation of the strong coupling constants $g_{D^*Dρ}$ and $g_{B^*Bρ}$ in light-cone sum rules including the one-loop QCD corrections of leading power with $ρ$ meson distribution amplitudes. We further compute the subleading-power corrections from two-particle and three-particle higher-twist contributions at leading order up to twist-4 accuracy. The next-to leading order corrections to leading power contribution offset the subleading-power corrections to some extend numerically, and our numerical results are consistent with previous works from sum rules. The comparisons between our results and the existing model-dependent estimations are also made.

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Chao Wang, Hua-dong Li. 2020-03-17. $D^*Dρ$ and $B^*Bρ$ strong couplings in light-cone sum rules. https://doi.org/10.1088/1674-1137%2F44%2F7%2F073103

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