Measurement of the eta->3pi0 Dalitz Plot Distribution with the WASA Detector at COSY

TL;DR

This study measures the eta to 3pi0 decay distribution using the WASA detector at COSY, providing precise data on the Dalitz plot and the slope parameter alpha, confirming previous findings and emphasizing pion interactions.

Contribution

First measurement of eta to 3pi0 Dalitz plot distribution at COSY with high statistics, refining the slope parameter alpha.

Findings

Slope parameter alpha = -0.027 ± 0.008 (stat) ± 0.005 (syst)

Results agree with previous measurements

Supports significance of pion-pion final state interactions

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 1.2e5 fully reconstructed events, and the quadratic slope parameter alpha 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.