Leptonic widths of high excitations in heavy quarkonia

Abstract

Agreement with the measured electronic widths of the $\psi (4040)$, $\psi (4415)$, and ${\rm Y}(11019)$ 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 $r\ga 1.2$ fm. The leptonic widths of the unobserved ${\rm Y}(7S)$ and $\psi (5S)$ resonances: ${\Gamma }_{e^{+}{e}^{-}}({\rm Y}(7S))=0.11$ keV and $\Gamma (\psi (5S))\approx 0.54$ keV are predicted.

11 pages revtex4

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• Bottomonium dipion transitions
• Strong decays and dipion transitions of Upsilon(5S)
• Di-Pion Decays of Heavy Quarkonium in the Field Correlator Method
• On the possibility to observe higher $n^3{D}_1$ bottomonium states in the $e^{+}{e}^{-}$ processes
• The Hyperfine Splittings in Bottomonium and the $B_q(q=n,s,c)$ Mesons
• Relativistic theory of string breaking in QCD
• Υ(5S) decays into BB and BBπ
• The Hyperfine Splittings in Heavy-Light Mesons and Quarkonia
• Higher ${\eta }_c(nS)$ and ${\eta }_b(nS)$ mesons
• Single eta production in heavy quarkonia: breakdown of multipole expansion