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most citedMeasurements of $\psip$ decays into and $γη\pipi$

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hep-ex2003

Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays

BES Collaboration, J. Z. Bai, Y. Ban +1

We observe a narrow enhancement near 2mp in the invariant mass spectrum of ppbar pairs from radiative J/psi-->gamma ppbar decays. The enhancement can be fit with either an S- or P-…