EPJ Web of Conferences (Jan 2017)

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

  • Mikhasenko Mikhail,
  • Jackura Andrew,
  • Ketzer Bernhard,
  • Szczepaniak Adam

DOI
https://doi.org/10.1051/epjconf/201713705017
Journal volume & issue
Vol. 137
p. 05017

Abstract

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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.