Abstract
BES data on J/ ψ→ γ( K + K − π 0) display a strong peak in the K + K − π 0 mass spectrum at 1450 MeV. This peak and a corresponding one in J/ ψ→ γ( ηπ + π −) at ∼1400 MeV may be fitted well by η(1440) with dominant decays to K ∗(890)K , using an s-dependent width in the Breit-Wigner amplitude. A broad background is also required in KK 0 (where K 0 stands for the Kπ S-wave) and also in ηππ, but is probably not resonant in this mass range.
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