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We derive a unitarized model for the peripheral production of the three-pion system in the isobar approximation. The production process takes into account long-range t-channel pion exchange. The K-matrix approach is chosen for the parameterization of the scattering amplitude. Five coupled channels are used to fit the COMPASS spin-density matrices for the JPCMϵ = 2−+0+ sector. Preliminary results of the fit are presented

Unitarity approach to the mass-dependent fit of 3πresonance production data from the COMPASS experiment