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Using data acquired with the CLEO-c detector at the CESR e+e- collider, wemeasure branching fractions for J/psi, psi(2S), and psi(3770) decays to gammapi0, gamma eta, and gamma eta'. Defining R_n = B[ psi(nS)-->gamma eta ]/B[psi(nS)-->gamma eta' ], we obtain R_1 = (21.1 +- 0.9)% and, unexpectedly, anorder of magnitude smaller limit, R_2 < 1.8% at 90% C.L. We also useJ/psi-->gamma eta' events to determine branching fractions of improvedprecision for the five most copious eta' decay modes.

Charmonium decays to gamma pi0, gamma eta, and gamma eta'