Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-08-09
Nucl.Phys. A614 (1997) 373-399
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages, LaTeX, 3 postscript figures
Scientific paper
10.1016/S0375-9474(96)00469-1
The equation of state of hot hadronic matter is obtained, by taking into account the contribution of the massive states with the help of the resonance spectrum $\tau (m)\sim m^3$ justified by the authors in previous papers. This equation of state is in agreement with that provided by the low-temperature expansion for the pion intracting gas. It is shown that in this picture the deconfinement phase transition is absent, in agreement with lattice gauge calculations which show the only phase transition of chiral symmetry restoration. The latter is modelled with the help of the restriction of the number of the effective degrees of freedom in the hadron phase to that of the microscopic degrees of freedom in the quark-gluon phase, through the corresponding truncation of the hadronic resonance spectrum, and the decrease of the effective hadron masses with temperature, predicted by Brown and Rho. The results are in agreement with lattice gauge data and show a smooth crossover in the thermodynamic variables in a temperature range $\sim 50$ MeV.
Burakovsky Leonid
Horwitz Lawrence P.
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