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[en] The photon spectrum in the radiative decay of J/PSI is analysed with a Breit-Wigner and background terms based on a duality hypothesis. We obtain a fit with a resonance, which is considered to be a 2+ gluonic bound state, of a mass around 2 GeV and a width around 0.6 GeV. Implications on the UPSILON and toponium decays are also discussed. (orig.)
Journal
Phys. Lett., B; ISSN 0370-2693; 
; v. 101(5); p. 344-348
; v. 101(5); p. 344-348