Search for ψ(2S)→γηc(2S) via fully reconstructed ηc(2S) decays

We report a search for the decay ψ(2S) → γη c (2S) in a sample of 25.9 × 10 6 ψ(2S) events collected with the CLEO-c detector. No signals are observed in any of the 11 exclusive η c (2S) decay modes studied, or in their sum. Product branching fraction upper limits are determined as a function of Γ[ ηc (2S)] for the 11 individual modes.