Phase Transition in Hot Pion Matter
arXiv:hep-ph/0010076 · doi:10.1016/S0370-2693(01)00082-X
Abstract
The equation of state for the pion gas is analyzed within the third virial approximation. The second virial coefficient is found from the pion-pion- scattering data, while the third one is considered as a free parameter. The proposed model leads to a first-order phase transition from the pion gas to a more dense phase at the temperature T_pt < 136 MeV. Due to relatively low temperature this phase transition cannot be related to the deconfinement. This suggests that a new phase of hadron matter - 'hot pion liquid' - may exist.
11 pages, Latex, 4 PS-figures. V2: A few misprints are corrected. Acknowledgments are added