Sigma-meson in hot and dense matter

Details Sigma-meson in hot and dense matter Sigma-meson in hot and dense matter

2002-03-18

arxiv.org/abs/hep-ph/0203170v2

Phys.Atom.Nucl. 66 (2003) 997-1004; Yad.Fiz. 66 (2003) 1030-1037

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 8 figures; figures 6,7 replaced

Scientific paper

10.1134/1.1577922

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.

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