Pion interaction with the trinucleon up to the eta production threshold

Abstract

Pion elastic, charge exchange scattering and induced eta production on the trinucleon systems are investigated in a coupled-channels approach in momentum space with Fadeev wave functions. The channel $\pi N\to \eta N$ is included using an isobar model with S-, P-, and D-wave resonances. While the coherent reactions like ${}^3$He($\pi ,\pi {)}^3$He can be reasonably well reproduced up to $T_{\pi }$=500 MeV, large discrepancies appear for the incoherent processes, ${}^3$He(${\pi }^{-},{\pi }^0{)}^3$H and ${}^3$He(${\pi }^{-},\eta {)}^3$H at backward angles and energies above $\Delta$-resonance. In the forward direction the $(\pi ,\eta )$ calculations underestimate the experimental measurements very close to threshold but agreement with the data improves with increasing pion energy. Predictions are made for the asymmetries of the various reactions on polarized ${}^3$He.

arXiv comment40 pages, 12 figures (available from the authors), Mainz preprint MKPH-T-92-13

Cited by in corpus (11)

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• Two-body Mechanisms in Pion Photoproduction on the Trinucleon
• Self energies of the pion and the delta isobar from the ^3He(e,e'pi^+)^3H reaction
• Charge-Symmetry Violation in Pion Scattering from Three-Body Nuclei
• Meson Exchange Currents in Kaon Scattering on the Lightest Nuclei
• Elastic Scattering of Pions From the Three-nucleon System
• Elastic Pion Scattering on the Deuteron in a Multiple Scattering Model
• Multiplicity distributions associated to subthreshold events in heavy-ion collisions