Thermal rho and sigma mesons from chiral symmetry and unitarity

Details Thermal rho and sigma mesons from chiral symmetry and unitarity Thermal rho and sigma mesons from chiral symmetry and unitarity

2002-06-24

arxiv.org/abs/hep-ph/0206238v2

Phys.Rev.C66:055201,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 5 figures, revtex. References and brief comments added. Final version to appear in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.66.055201

We study the temperature evolution of the rho and sigma mass and width, using a unitary chiral approach. The one-loop pion-pion scattering amplitude in Chiral Perturbation Theory at finite temperature is unitarized via the Inverse Amplitude Method. Our results predict a clear increase with T of both the rho and sigma widths. The masses decrease slightly for high T, while the rho-pion-pion coupling increases. The rho behavior seems to be favored by experimental results. In the sigma case, it signals chiral symmetry restoration.

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