Light-Cone Sum Rules for the D(s)→η(′)lνlD_{(s)}\rightarrow η^{(\prime)} l ν_l Form Factor

preprint2013arXivOpen access

Abstract

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

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