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Thermal rho and sigma mesons from chiral symmetry and unitarity

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arxiv hep-ph/0206238 v2 pith:46XRK3OX submitted 2002-06-24 hep-ph nucl-th

Thermal rho and sigma mesons from chiral symmetry and unitarity

classification hep-ph nucl-th
keywords chiralsigmaamplituderesultssymmetrytemperatureapproachbehavior
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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