Abstract
Finite-temperature behavior of quantum chromodynamics with two light dynamical flavors is studied by Langevin simulation on a ${8}^{3}$\ifmmode\times\else\texttimes\fi{}4 lattice with the Kogut-Susskind quark action. It is found that the chiral transition strengthens as the quark mass ${m}_{q}$ decreases towards zero, changing from a continuous crossover at ${m}_{q}$a=0.2 to a first-order transition at ${m}_{q}$a=0.1. The critical coupling at ${m}_{q}$=0 is estimated to be ${\ensuremath{\beta}}_{c}$=6/${g}_{c}^{2}$=5.29--5.32, and the physical scale of ${T}_{c}$\ensuremath{\simeq}(0.19--0.24)${m}_{\ensuremath{\rho}}$. .AE
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