The Ratio $\mathcal{R}(D)$ and the $D$-meson Distribution Amplitude

Tao Zhong, Yi Zhang, Xing-Gang Wu +2

In this paper, we calculate the $B\to D$ transition form factors (TFFs) within the light-cone sum rules (LCSR) and predict the ratio $\mathcal{R}(D)$. More accurate $D$-meson distr…