Radiative Decay of the ψ(2S) into Two Pseudoscalar Mesons
BES Collaboration
Abstract
Radiative decays of the radially excited charmonium resonance, ψ(2S), into ππ, K Kbar and ηηfinal states have been measured in a sample of 3.96 * 106 ψ(2S) events collected by the BES collaboration. The branching ratios B(ψ(2S) -> γf2(1270)) = (2.27 +- 0.26 +- 0.39) * 10-4 and B(ψ(2S) -> γf0(1710)) * B(f0(1710) -> K+ K-) = (5.59 +- 1.12 +- 0.93) * 10-5 are obtained. When compared to the corresponding radiative J/ψdecays, the observed ψ(2S) radiative decay rates into γf2(1270) and γf0(1710) are consistent with the 15% rule.
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