Light-Cone Sum Rules for the $D_{(s)}\to \hat{I}{\cdot }^{(\prime )}l\hat{I}{½}_l$ Form Factor

Abstract

We present an improved light-cone sum rule analysis of the decay form factors of $D$ and $D_s$ into $\hat{I}\cdot$ and $\hat{I}{\cdot }^{\prime }$ and argue that these decays offer a very promissing possibility to determine the leading Fock-state gluonic contribution of the $\hat{I}{\cdot }^{\prime }$ at future experimental facilities as FAIR or Super-KEKB. We also give the corresponding branching ratios for B decays.

10 pages, 5 figures, Minor wording changes and some references added, results unchanged