Hybrid simulations of lattice QCD with four flavors of staggered quarks were performed on a 12³×{}4 lattice for quark masses of 0.1, 0.2, 0.4, and 0.8 (lattice units). The order parameters were measured near the finite-temperature transition. No clear signal of a first-order transition was seen.
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Kogut et al. (1989) studied this question.
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