| Journal: | Brazilian journal of physics |
| Database: | PERIÓDICA |
| System number: | 000398969 |
| ISSN: | 0103-9733 |
| Authors: | Ghosh, Sabyasachi1 |
| Institutions: | 1Universidade Estadual Paulista "Julio de Mesquita Filho", Instituto de Fisica Teorica, Sao Paulo. Brasil |
| Year: | 2014 |
| Season: | Dic |
| Volumen: | 44 |
| Number: | 6 |
| Pages: | 789-797 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico |
| English abstract | 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 (πB) loops are consider. On the other side, the in-medium self-energy of N∗(1535) for πN and ηN loops is also determined in the same framework. The detail branch cut structures for these different πB loops for nucleon N (940) and πN, ηN loops for N∗(1535) are addressed. Using the total self-energy of N (940) and N∗(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∗(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∗(1535). The non-trivial modifications of these chiral partners may indicate some association of chiral symmetry restoration |
| Disciplines: | Física y astronomía |
| Keyword: | Física nuclear, Teoría de campo térmico, Hadrones, Nucleones, Autoenergía |
| Keyword: | Physics and astronomy, Nuclear physics, Thermal field theory, Hadrons, Nucleons, Self-energy |
| Full text: | Texto completo (Ver PDF) |
