Uncertainties of the $B\to D$ transition form factor from the $D$-Meson Leading-Twist Distribution Amplitude

Yi Zhang, Tao Zhong, Xing-Gang Wu +3

The $B\to D$ transition form factor (TFF) $f_{+}^{B\to D}(q^2)$ is determined mainly by the $D$-meson leading-twist distribution amplitude (DA) , ${\varphi }_{2;D}$, if the proper chiral curr…