Finite temperature spectral functions of the linear O(N)-model at large-N applied to the π-σ system

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Abstract

The thermal evolution of the spectral densities derivable from the two-point functions of the elementary and the quadratic composite fields of the O(N) model is studied in the isosinglet channel and in the broken symmetry phase at infinite N. The results are applied with realistic parameter values to the N = 4 case. They provide a reasonable description of the σ meson at T = 0. Threshold enhancement is observed around T ∼ 1.07 mπ. For higher temperatures the maximum of the spectral function in the single meson channel decreases and becomes increasingly rounded.

Original languageEnglish
Pages (from-to)77-85
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume537
Issue number1-2
DOIs
Publication statusPublished - Jun 13 2002

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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