Measurement of the eta->pi+pi-pi0 decay with WASA-at-COSY detector

TL;DR

This paper reports on the measurement of the eta->pi+pi-pi0 decay using the WASA-at-COSY detector, aiming to study isospin violation related to quark mass differences through Dalitz plot analysis.

Contribution

It presents the current status of analyzing eta decay channels in proton-deuteron and proton-proton reactions with the WASA-at-COSY detector, focusing on isospin violation effects.

Findings

Analysis of eta->pi+pi-pi0 decay underway

Dalitz plot parameters being extracted

Initial results support isospin violation studies

Abstract

One of the objectives of the physics programme of the WASA-at-COSY facility is to study the isospin violating eta hadronic decays into pi+pi-pi0$ systems driven by the term of QCD Lagrangian which depends on the d and u quark mass difference. These studies can be made in terms of the Dalitz plot parameters describing the density population which is proportional to the square of the amplitude |A(x,y)|^2. This contribution describes the current status of the analysis of the eta->pi+pi-pi0 decay in the pd->3He eta and as well in the pp->pp eta reaction with WASA-at-COSY.