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We present feasibility studies of the measurement of η meson decay into a 4π0 system using the WASA-at-COSY detector. Kinematics of the pp → ppη → pp4π0 → pp8γ reactions and response of the WASA-at-COSY detector were simulated. The identification of the η → 4π0 → 8γ decay was based on the invariant mass method for both π0 and η mesons. As a result, the resolution of the invariant mass determination of the η meson was established to σ = 31 MeV/c2. The efficiency of the WASA-at-COSY detector for the measurement and reconstruction of the pp → ppη → pp4π0 → pp8γ reaction was determined to be 1.5%

Monte Carlo studies ofη→ 4π0CP symmetry violating decay with WASA-at-COSY detector

Monte Carlo studies ofη→ 4π⁰CP symmetry violating decay with WASA-at-COSY detector