Properties of N∗(1535) at finite density in the extended parity-doublet models

✍ Scribed by Hungchong Kim; D. Jido; M. Oka

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 628 KB
• Volume: 640
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(98)00451-5

✦ Synopsis

We improve so-called "naive" and "mirror" models for the positive and negative parity nucleons, N and N*, by introducing non-linear 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, gANN*, which could appear either as suppression or as enhancement of N* ~ 7rN decay in the medium. @ 1998 Elsevier Science B.V.