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A narrow peak in the pi+ pi- mass distribution was seen by the Rome-SyracuseCollaboration in bar-p n --> 2 pi+ 3 pi- annihilation at rest 39 years ago. Thereanalysis of this peak finds a mass of 757.4 +- 2.6 MeV/c^2 and a widthslightly narrower than the experimental resolution. The evidence of the peak is5.2 standard deviations. This state is generated in (12.4 +- 2.4)% of the bar-pn --> 2 pi+ 3 pi- annihilations at rest. No spin analysis is possible with thestatistics of the experiment.

Study of a narrow pi+ pi- peak at about 755 MeV/c^2 in bar-p n --> 2 pi+ 3 pi- annihilation at rest