Elsevier, Physics Letters B, 3(291), p. 347-354, 1992
DOI: 10.1016/0370-2693(92)91057-g
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The results of a measurement of p̄p annihilation at rest into ηηπ0 are presented. Assuming a resonance dominated model for the annihilation process an isoscalar JPC=0++ resonance decaying into ηη is observed with a mass of 1560±25 MeV/c2 and a width of 245±50 MeV/c2.