Meson-Baryon Interactions in Unitarized Chiral Perturbation Theory

Details Meson-Baryon Interactions in Unitarized Chiral Perturbation Theory Meson-Baryon Interactions in Unitarized Chiral Perturbation Theory

2002-11-29

arxiv.org/abs/nucl-th/0211098v1

AIP Conf.Proc.660:34-47,2003

Physics

Nuclear Physics

Nuclear Theory

14 pages, 3 figures; Talk at 2nd International Workshop On Hadron Physics: Effective Theories Of Low-Energy QCD, Coimbra, Port

Scientific paper

10.1063/1.1570558

Meson-Baryon Interactions can be successfully described using both Chiral Symmetry and Unitarity. The $s-$wave meson-baryon scattering amplitude is analyzed in a Bethe-Salpeter coupled channel formalism incorporating Chiral Symmetry in the potential. Two body coupled channel unitarity is exactly preserved. The needed two particle irreducible matrix amplitude is taken from lowest order Chiral Perturbation Theory in a relativistic formalism. Off-shell behavior is parameterized in terms of low energy constants. The relation to the heavy baryon limit is discussed. The position of the complex poles in the second Riemann sheet of the scattering amplitude determine masses and widths baryonic resonances of the N(1535), N(1670), $\Lambda (1405)$ and $\Lambda(1670)$ resonances which compare well with accepted numbers.

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