Journal
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
Volume 31, Issue 5, Pages 417-425Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0954-3899/31/5/012
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Agreement with the measured electronic widths of the resonances psi (4040), psi (4415) and Y (11 019) is shown to be obtained if two effects are taken into account: (i) a flattening of the confining potential at distances r >= 1.2 fm, which gives a drop in the leptonic widths of high excitations of about 10-20 %, but does not affect low-lying states, and (ii) switching off the gluon-exchange (GE) interaction for those nS states which have a rms radius r(n) >= 1.4 fm. We also show that an exponential type of screening of the GE interaction barely changes the leptonic widths, Gamma (n S), for n <= 5. The leptonic widths of Gamma(e+e-)(Y(7S)) = 0.11 keV and Gamma(psi(5S)) approximate to 0.54 keV are predicted.
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