Suppression of Pi NN* Coupling and Chiral Symmetry

Details Suppression of Pi NN* Coupling and Chiral Symmetry Suppression of Pi NN* Coupling and Chiral Symmetry

1998-01-20

arxiv.org/abs/hep-ph/9801354v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10pp, LaTeX, use sprocl.sty. Talk given by D.J. at APCTP workshop ``Properties of Hadrons in Matter'', Seoul, Korea in October

Scientific paper

Meson-baryon couplings between positive and negative parity nucleons are investigated using two point correlation functions in the soft meson and the chiral limit. We find that the pi NN* coupling vanishes due to chiral symmetry, while the eta NN* coupling remains finite. We perform an analysis based on the algebraic method for SU(2) chiral symmetry, and find that nucleon axial charges play an essential role for vanishing coupling constants. For an illustration, we construct sigma models with N and N*, where we discuss their properties from the view point of the chiral symmetry. We also discuss N and N* in the viewpoint of chiral partner.

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