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: firstname.lastname@example.org
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
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.