A dynamical model for correlated two-pion-exchange in the pion-nucleon interaction
C. Schütz, J. W. Durso, K. Holinde, B. C. Pearce, J. Speth
Abstract
A microscopic model for the N Nππ process is presented in the meson exchange framework, which in the pseudophysical region agrees with available quasiempirical information. The scalar (σ) and vector (ρ) piece of correlated two--pion exchange in the pion--nucleon interaction is then derived via dispersion integrals over the unitarity cut. Inherent ambiguities in the method and implications for the description of pion--nucleon scattering data are discussed.
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