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It has been realized for a long time that knowing the \eta and \eta' wavefunctions in terms of quark and gluon components probes our understanding ofnon-perturbative QCD dynamics. Great effort has been given to this challenge --yet no clear picture has emerged even with the most recent KLOE data. We pointout which measurements would be most helpful in arriving at a more definiteconclusion. A better knowledge of these wave functions will significantly helpto disentangle the weight of different decay subprocesses in semi-leptonicdecays of D^+, D_s^+ and B^+ mesons. The resulting insights will beinstrumental in treating even non-leptonic B transitions involving $\eta$ and$\eta^{\prime}$ and their CP asymmetries; thus they can sharpen the case for oragainst New Physics intervening there.

\eta - \eta' Mixing -- From Electromagnetic Transitions to Weak Decays of Charm and Beauty Hadrons (presented at Hadron 2011)