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End point of the first-order phase transition of QCD in the heavy quark region by reweighting from quenched QCD
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We study the end point of the first-order deconfinement phase transition in two and 2+1 flavor QCD in the heavy quark region of the quark mass parameter space. We determine the location of critical point at which the first-order deconfinement phase transition changes to crossover, and calculate the pseudo-scalar meson mass at the critical point. Performing quenched QCD simulations on lattices with the temporal extents Nt=6 and 8, the effects of heavy quarks are determined using the reweighting method. We adopt the hopping parameter expansion to evaluate the quark determinants in the reweighting factor. We estimate the truncation error of the hopping parameter expansion by comparing the results of leading and next-to-leading order calculations, and study the lattice spacing dependence as well as the spatial volume dependence of the result for the critical point. The overlap problem of the reweighting method is also examined. Our results for Nt=4 and 6 suggest that the critical quark mass decreases as the lattice spacing decreases and increases as the spatial volume increases.
Forward citations
Cited by 2 Pith papers
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First-order phase transitions in the heavy quark region of lattice QCD at high temperatures and high densities
In the heavy quark region of QCD, the phase transition is predicted to become first-order again at very high baryon chemical potential, after first turning into a crossover at moderate density.
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The order of the chiral phase transition in massless many-flavour lattice QCD
Lattice QCD simulations with up to seven flavors indicate that the first-order chiral transition seen on coarse lattices is a cutoff artifact, so the continuum chiral transition is second-order for all flavors up to t...
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