Abstract
One of the objectives of the physics programme of the WASA-at-COSY facility is to study the isospin violating η hadronic decays into π+π-π0 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 η → π+π-π0 decay in the pd →3 Heη and as well in the pp → ppη reaction with WASA-at-COSY.
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