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Evidence for psi' decays into gamma pi^0 and gamma eta (1011.0885v1)

Published 3 Nov 2010 in hep-ex

Abstract: The decays psi'->gamma pi^0, gamma eta and gamma eta' are studied using data collected with the BESIII detector at the BEPCII e^{+e^-} collider. Processes psi'->gamma pi⁰ and psi'->gamma eta are observed for the first time with signal significances of 4.6 sigma and 4.3 sigma, respectively. The branching fractions are determined to be: B(psi'->gamma pi^{0)=(1.58+-0.40+-0.13)x10^{-6},} B(psi'->gamma eta)=(1.38+-0.48+-0.09)x10^{-6}, and B(psi'->gamma eta')=(126+-3+-8) x 10^{-6}, where the first errors are statistical and the second ones systematic.