QCD at finite temperature in the quark composites approach

We investigate QCD at finite temperature in the quark composites approach, which is based on the use of quark composites with hadronic quantum numbers as fundamental variables. We find that chiral symmetry restoration and qua rk deconfinement are one and the same first order phase transition, whose c ritical temperature, in a one loop approximation, is T = 2 root Omega rho(- 2)m(pi), where m(pi) is the pion mass, Omega = 24 the number of up and down quark components, and rho a parameter of order 1 whose precise value can b e determined by the study of the pion-pion interaction.