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One of the objectives of the vast physics programme of the recentlycomissioned WASA-at-COSY facility is the study of fundamental symmetries viathe measurements of the eta and eta-prime mesons decays. Especially interestingare isospin violating hadronic precesses of these mesons into 3pi systemsdriven by the term of QCD Lagrangian which depends on the mass difference ofthe u and d quarks. When an eta or an eta-prime meson is created in thehadronic reaction signals from such decays may be significantly obscured by theprompt production of pi mesons. In this thesis we present the estimation of theupper limit of the background due to prompt pion production for the eta-prime->3pi0 and eta-prime->pi+pi-pi decays. Using the data from proton-protoncollisions measured by the COSY-11 group we have extracted differential crosssections for the multimeson production with the invariant mass corresponding tothe mass of the eta-prime meson. Based on these results and on parametrizationsof the total cross sections for the eta-prime meson as well as parametrizationof the upper limit for the prompt pi+pi-pi0 production in the collisions ofprotons we discuss in details the feasibility of a measurement of the eta-primemeson decay into 3pi channels with the WASA-at-COSY facility. Based on thechiral unitary approach the value of the branching ratioBR(eta-prime->pi+pi-pi0) was recently predicted to be about 1%. We show thatthe WASA-at-COSY has a potential to verify this result empirically.

Feasibility study of the eta-prime -> pi+pi-pi0 decay using WASA-at-COSY apparatus