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We present an improved light-cone sum rule analysis of the decay form factorsof $D$ and $D_s$ into $\eta$ and $\eta^{\prime}$ and argue that these decaysoffer a very promissing possibility to determine the leading Fock-state gluoniccontribution of the $\eta'$ at future experimental facilities as FAIR orSuper-KEKB. We also give the corresponding branching ratios for B decays.

Light-Cone Sum Rules for the $D_{(s)}\rightarrow \eta^{(\prime)} l \nu_l$ Form Factor