Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-06-05
Nucl.Phys. A640 (1998) 77-88
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages (including two postscript figures), revtex
Scientific paper
10.1016/S0375-9474(98)00451-5
We improve so called ``naive'' and ``mirror'' models for the positive and negative parity nucleons, $N$ and $N^{*}$, by introducing nonlinear terms allowed by chiral symmetry. Both models in this improvement reproduce the observed nucleon axial charge in free space and reveal interesting density dependence of the axial charges for $N$ and $N^*$, and the doublet masses. A remarkable difference between the two models is found in the off-diagonal axial charge, $g_{ANN^*}$, which could appear either as suppression or as enhancement of $N^* \to \pi N$ decay in the medium.
Jido Daisuke
Kim Hungchong
Oka Makoto
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