ABSORPTION AND DISPERSION OF PIONS AT FINITE TEMPERATURE

被引：95

作者：

SCHENK, A

机构：

[1] Institute for Theoretical Physics, University of Bern, CH-3012 Bern

来源：

NUCLEAR PHYSICS B | 1991年 / 363卷 / 01期

关键词：

D O I：

10.1016/0550-3213(91)90236-Q

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We consider the pole shift in the propagator and analyse both absorptive and dispersive properties of pions at finite temperature. The leading-order term in an expansion in powers of the density is determined by the pi-pi forward scattering amplitude. We evaluate this amplitude in a semi-phenomenological manner, using chiral perturbation theory at threshold and relying on experimental information at higher energies. In particular we analyse the contributions generated by rho-exchange and show that they substantially modify the lowest-order prediction of chiral perturbation theory.

引用

页码：97 / 113

页数：17