Abstract
We study the temperature evolution of the $\ensuremath{\rho}$ and $\ensuremath{\sigma}$ mass and width, using a unitary chiral approach. The one-loop $\ensuremath{\pi}\ensuremath{\pi}$ scattering amplitude in chiral perturbation theory at $T\ensuremath{\ne}0$ is unitarized via the inverse amplitude method. Our results predict a clear increase with T of both the $\ensuremath{\rho}$ and $\ensuremath{\sigma}$ widths. The masses decrease slightly for high T, while the $\ensuremath{\rho}\ensuremath{\pi}\ensuremath{\pi}$ coupling increases. The $\ensuremath{\rho}$ behavior seems to be favored by experimental results. In the $\ensuremath{\sigma}$ case, it signals chiral symmetry restoration.
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