Pattern of chiral symmetry restoration at finite temperature in a supersymmetric composite model

The structure of chiral symmetry restorations at finite temperature is thor oughly investigated in the supersymmetric Nambu-Jona-Lasinio model with a s oft supersymmetry breaking term. It is found that the broken chiral symmetr y at vanishing temperature is restored at sufficiently high temperature in two patterns, i.e., the first order and second order phase transition depen ding on the choice of the coupling constant G and the supersymmetry breakin g parameter Delta. The critical curves expressing the phase boundaries in t he G-Delta plane are completely determined and the dynamically generated fe rmion mass is calculated as a function of temperature. (C) 1999 Published b y Elsevier Science B.V. All rights reserved.