Scaling Relation for Leptonic Constants\\ of Higher Excitations in Heavy Quarkonium

Abstract

Using a specific scheme of the QCD sum rules, one derives the relation for leptonic constants of $nS$-wave heavy qiarkonia, so $f^2_{n_1}/f^2_{n_2}= n_2/n_1$, that does not depend on the quarkonium content, and it is in a good agreement with the experimental values of constants for the $ψ$- and $Υ$-families.