Unitarity approach to the mass-dependent fit of 3π resonance production data from the COMPASS experiment
1 Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany
2 Indiana University, Bloomington, IN, U.S.A.
3 Thomas Jefferson National Accelerator Facility, Newport News VA, U.S.A.
a e-mail: email@example.com
Published online: 22 March 2017
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.
© The Authors, published by EDP Sciences, 2017
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