Agreement with the measured electronic widths of the ψ(4040), ψ(4415), and Υ(11019) resonances is shown to be reached if two effects are taken into account: a flattening of the confining potential at large distances and a total screening of the gluon-exchange interaction at r\ga1.2 fm. The leptonic widths of the unobserved Υ(7S) and ψ(5S) resonances: Γe+e−(Υ(7S))=0.11 keV and Γ(ψ(5S))≈0.54 keV are predicted.
@article{arxiv.hep-ph/0411291,
title = {Leptonic widths of high excitations in heavy quarkonia},
author = {A. M. Badalian and A. I. Veselov and B. L. G. Bakker},
journal= {arXiv preprint arXiv:hep-ph/0411291},
year = {2011}
}