Log triviality in the Nambu-Jona-Lasinio model

Results are presented from a Monte Carlo simulation of the Nambu - Jona-Lasinio model with SU(2)xSU(2) chiral symmetry and N-f = 2 flavors of fermion. We show that fits to the equation of state are sensitive to the shape and extent of the assumed scaling region; the best fits favour a triviality scenario predicted by the large-N-j approximation, in which the scalar degrees of freedom are fermion - anti-fermion composites with wavefunction renormalisation constant vanishing logarithmically in the continuum limit.