  Lattice QCD with additional chiral-invariant four-fermion interactions is
studied at nonzero temperature. Staggered Kogut-Susskind quarks are used. The
four-fermion interactions are implemented by introducing bosonic auxiliary
fields. A mean field treatment of the auxiliary fields is used to calculate the
model's asymptotic scale parameter and perturbative thermodynamics, including
the one-loop gluonic contributions to the energy, entropy, and pressure. In
this approach the calculations reduce to those of ordinary lattice QCD with
massive quarks. Hence, the previous calculations of these quantities in lattice
QCD using massless quarks are generalized to the massive case.
