Pion entropy and phase-space densities in A+A collisions

Abstract

We propose a method to estimate the entropy of thermal pions in A+A collisions irrespective of unknown form of freeze-out (isothermal) hypersurface and transverse flows developed. We analyse the average phase-space densities and entropies of the thermal pions vs their multiplicities and collision energies. The behaviour of these values apparently indicates the deconfinement and chiral phase transitions in relativistic nuclear-nucleus collisions

Comments: 8 pages, 3 figures, talk presented by Yu.M. Sinyukov during the 3rd Budapest Winter School on Heavy Ion Physics, Dec. 8-11, 2003, Budapest, Hungary