Rho and Sigma Mesons in Unitarized Thermal ChPT

Details Rho and Sigma Mesons in Unitarized Thermal ChPT Rho and Sigma Mesons in Unitarized Thermal ChPT

2002-12-13

arxiv.org/abs/hep-ph/0212184v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Proc. Workshop Strong and Electroweak Matter 02, Heidelberg, Germany

Scientific paper

We present our recent results for the rho and sigma mesons considered as resonances in pion-pion scattering in a thermal bath. We use chiral perturbation theory to fourth order in p for the low energy behaviour, then extend the analysis via the unitarization method of the Inverse Amplitude into the resonance region. The width of the rho broadens about twice the amount required by phase space considerations alone, its mass staying practically constant up to temperatures of order 150 MeV. The sigma meson behaves in accordance to chiral symmetry restoration expectations.

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