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[en] We show that the GLM model, along with a prescription implementing the unitarity condition, perfectly describes the complete (real and imaginary) s- and p-wave π-N amplitude from threshold up to the 33-resonance region, including the π-N Σ-term. (orig.)
Journal
[en] In this paper we continue to study the mixing of fermionic fields with different parities. Here we are interested in the manifestation of the latter in pion-nucleon scattering, which is analyzed for systems with particles having 3/2± spins. Also, theoretical calculations are compared with experimental data from the partial analysis.
Journal
Physics of Particles and Nuclei Letters (Print); ISSN 1547-4771; 
; v. 9(9-10); p. 772-775
; v. 9(9-10); p. 772-775
[en] In this paper an optimal state analysis of pion-nucleon elastic scattering data is presented. Then, it is shown that the optimal state predictions are experimentally satisfied to a surprising accuracy even for a single optimal state description of pion-nucleon elastic scattering, for all pLAB higher then 3 GeV/c. The optimal state analysis as an important alternative to the phase shift analysis is discussed. (Author)
Journal
[en] A review is given of recent developments in the study of the pion-nucleus interaction. Knowledge gained from experiments concerning the reaction mechanism and the influence of the nuclear environment on the pion interaction is discussed. The similarity of the physics deduced from multiple scattering theories, isobar-hole formulations and field theory models is indicated, and the importance of multi-nucleon effects is emphasized. (orig.)
Journal
Nuclear Physics. A; ISSN 0375-9474; ; v. 335(1/2); p. 289-307
; v. 335(1/2); p. 289-307
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