Chiral unitary approach to the pi N*N*, eta N*N* couplings for the N* (1535) resonance

摘要

Using a chiral unitary model in which the negative parity nucleon resonance N* = N*(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*N* and eta N*N* couplings. The eta(0)N*N* coupling has smaller strength hut the same sign as the eta(0)NN coupling. This rules out the mirror assignment of chiral symmetry where the ground state nucleon N and the negative parity resonance N* are envisaged as chiral partners in the baryon scoter. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 34]