Chiral Unitary Approach To The N*N*pi, N*N*eta Couplings For The N*(1535) Resonance

Details Chiral Unitary Approach To The N*N*pi, N*N*eta Couplings For The N*(1535) Resonance Chiral Unitary Approach To The N*N*pi, N*N*eta Couplings For The N*(1535) Resonance

1999-06-08

arxiv.org/abs/nucl-th/9906018v2

Nucl.Phys. A678 (2000) 187-211

Physics

Nuclear Physics

Nuclear Theory

30 pages, 15 figures (ps files). The new version discusses pi-N scattering around the N*(1535) resonance

Scientific paper

10.1016/S0375-9474(00)00311-0

Using a chiral unitary model in which the negative parity nucleon resonance $N^\ast \equiv N^\ast(1535)$ is generated dynamically by means of the Bethe Salpeter equation with coupled meson baryon channels in the $S = 0$ sector, we have obtained the $\pi^0 N^\ast N^\ast$ and $\eta N^\ast N^\ast$ couplings. The $\pi^0 N^\ast N^\ast$ coupling has smaller strength and the same sign as the $\pi^0 N N$ coupling. This rules out the mirror assignment of chiral symmetry where the ground state nucleon $N$ and the negative parity resonance $N^\ast$ are envisaged as chiral partners in the baryon sector.

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