UC Irvine

Radiative decays of the radially excited charmonium resonance, Ψ(2S), into ππ, KK̄ and ηη final states have been measured in a sample of 4.02×106 Ψ(2S) events collected by the BES Collaboration. The branching ratios B(Ψ(2S)→γf 2(1270))=(2.12±0.19±0.32) × 10-4 and B(Ψ(2S)→γf0(1710))×B(f0(1710) →K+K-=(3.02±0.45±0.66)×10 -5 are obtained. When compared to the corresponding radiative J/Ψ decays, the observed Ψ(2S) radiative decay rates into γf 2(1270) and γf00(1710) are consistent with the prediction of the "12%" rule. © 2003 The American Physical Society.