Selfconsistent calculations of sigma-meson properties at finite temperature
| dc.creator | Roder, Dirk | |
| dc.date | 2005-09-22 | |
| dc.date | 2006-02-15 | |
| dc.date.accessioned | 2026-07-07T06:42:07Z | |
| dc.date.available | 2026-07-07T06:42:07Z | |
| dc.description | I study the properties of the scalar sigma-meson [also referred to as f_0(600)] at nonzero temperature in the O(N)-model in the framework of the Cornwall-Jackiw-Tomboulis formalism. In the standard Hartree (or large-N) approximation one only takes into account the double-bubble diagrams in the effective potential. I improve this approximation by additionally taking into account the sunset diagrams, which lead to 4-momentum dependent real and imaginary parts of the Dyson-Schwinger equations. By solving these and the equation for the chiral condensate selfconsistently, one obtains the decay width and the spectral density of the sigma-meson. I compare the results in the case with explicit chiral symmetry breaking with the chiral limit. I found that the 4-momentum dependent real part of the selfenergy does not lead to major qualitative changes in the spectral density. | |
| dc.description | 16 pages, 7 figures. Minor changes in the text and some references added | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0509232 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0509232 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/101923 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | Nuclear Theory | |
| dc.title | Selfconsistent calculations of sigma-meson properties at finite temperature | |
| dc.type | text |