QCD sum rules for parameters of the $B$-meson distribution amplitudes

Muslem Rahimi, Marcel Wald

We obtain new estimates for the parameters ${\lambda }_E^2$, ${\lambda }_H^2$ and their ratio $\mathcal{R}={\lambda }_E^2/{\lambda }_H^2$, which appear in the second moments of the $B$-meson light-cone distribu…