Abstract
We investigate the role of chiral symmetry in the properties of positive and negative parity nucleons ( N and N ∗ ). When we consider two kinds of nucleons, two distinctive types of chiral assignment for N ∗ can be introduced. There are interesting differences between the two assignments in the properties of nucleons, which are studied using linear sigma models based on the two assignments. Behavior of N and N ∗ in the nuclear medium is also investigated using these linear models.
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