Abstract
In the first production run of the WASA experiment at COSY, the eta decay into three neutral pions was measured in proton–proton interactions at a proton beam kinetic energy of 1.4 GeV. The Dalitz plot of the three pions was studied using 1.2×105 fully reconstructed events, and the quadratic slope parameter α was determined to be −0.027±0.008(stat)±0.005(syst). The result is consistent with previous measurements and further corroborates the importance of pion–pion final state interactions.
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