arXiv:hep-ph/0203170·v2·High Energy Physics — Phenomenology
Sigma-meson in hot and dense matter
M. K. Volkov🇷🇺 · A.E. Radzhabov🇷🇺 · N. L. Russakovich🇷🇺
Abstract
An important role of the scalar isoscalar sigma-meson in the low-energy physics is discussed. The behavior of the sigma-meson in the hot and dense medium is studied. It is shown that in the vicinity of critical values of temperature(T) and chemical potential(m) the sigma-meson can become a sharp resonance. This effect can lead to a strong enhancement of the processes pi pi -> gamma gamma and pi pi-> pi pi near the two-pion threshold. Experimental observation of this phenomenon can be interpreted as a signal of approaching the domain where the chiral symmetry restoration and phase transition of the hadron matter into quark-gluon plasma take place.
Comments: 16 pages, 8 figures; figures 6,7 replaced