The Scalar $B\to \pi$ and $D\to \pi$ Form Factors in QCD

A. Khodjamirian, R. Rückl, C. W. Winhart

QCD sum rules on the light-cone are derived for the sum $f^{+}+f^{-}$ of the $B\to \pi$ and $D\to \pi$ form factors taking into account contributions up to twist four. Combining the resu…