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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A Comparative Analysis of In-Medium Spectral Functions for N(940) and N (au)(1535) in Real-Time Thermal Field Theory

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Ghosh, Sabyasachi [1]
Total Authors: 1
[1] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Brazilian Journal of Physics; v. 44, n. 6, p. 789-797, DEC 2014.
Web of Science Citations: 3

In the real-time thermal field theory, the nucleon self-energy at finite temperature and density is evaluated where an extensive set of pion-baryon (pi B) loops are consider. On the other side, the in-medium self-energy of N (au)(1535) for pi N and eta N loops is also determined in the same framework. The detail branch cut structures for these different pi B loops for nucleon N(940) and pi N, eta N loops for N (au)(1535) are addressed. Using the total self-energy of N(940) and N (au)(1535), which contain the contributions of their corresponding loop diagrams, the complete structures of their in-medium spectral functions have been obtained. The Landau and unitary cut contributions provide two separate peak structures in the nucleon spectral function while N (au)(1535) has a single peak structure in its unitary cuts. At high temperature, the peak structures of both at their individual poles are attenuated while at high density Landau peak structure of nucleon is completely suppressed and its unitary peak structure is tending to be shifted towards the melted peak of N (au)(1535). The non-trivial modifications of these chiral partners may indicate some association of chiral symmetry restoration. (AU)

FAPESP's process: 12/16766-0 - Spectral and transport properties of charmed mesons in hot and dense hadronic matter
Grantee:Sabyasachi Ghosh
Support type: Scholarships in Brazil - Post-Doctorate