Evidence for ψ' Decays into γπ0 and γη

The decays ψ^'→γπ⁰, γη and γη^' are studied using data collected with the BESIII detector at the BEPCII e⁺e^- collider. The processes ψ^'→γπ⁰ and ψ^'→γη are observed for the first time with signal significances of 4.6σ and 4.3σ, respectively. The branching fractions are determined to be B(ψ^'→γπ⁰)=(1.58±0.40±0.13)×10^-6, B(ψ^'→γη)=(1.38±0.48±0.09)×10^-6, and B(ψ^'→γη^')=(126±3±8)×10^-6, where the first errors are statistical and the second ones systematic.