THERMAL-PROPERTIES OF A HOT PION GAS BEYOND THE QUASI-PARTICLE APPROXIMATION

Authors
RAPP R WAMBACH J
Citation
R. Rapp et J. Wambach, THERMAL-PROPERTIES OF A HOT PION GAS BEYOND THE QUASI-PARTICLE APPROXIMATION, Physics letters. Section B, 351(1-3), 1995, pp. 50-55
Citations number
22
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
351
Issue
1-3
Year of publication
1995
Pages
50 - 55
Database
ISI
SICI code
0370-2693(1995)351:1-3<50:TOAHPG>2.0.ZU;2-6
Abstract
Within the Matsubara formalism we derive expressions for the pion self energy and the two-pion propagator in a hot pion gas. These quantities are used to selfconsistently calculate the in-medium pi pi amplitude beyond the quasiparticle approximation (QPA). The results are shown to differ significantly from QPA-based calculations. We also examine the impact of chiral constraints on the pi pi interaction in a chirally i mproved version of the Julich pi pi model.