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We perform lattice numerical simulations to study the phase transition of QCDat finite temperature to clarify the nature of the transition of massless twoflavor QCD. We investigate QCD with two light and Nf heavy quarks instead oftwo-flavor QCD, and focus on the light quark mass dependence of the criticalheavy mass, below which the transition is of first order. The heavy quarks areincorporated into two flavor configurations in the form of the hoppingparameter expansion through the reweighting technique. The nature of thetransition is identified by the shape of the constraint effective potential atthe critical temperature. Our result indicates that the critical heavy massremains finite in the chiral limit of the two flavors, suggesting the phasetransition of massless two-flavor QCD is of second order.

Many flavor approach to study the nature of chiral phase transition of two-flavor QCD