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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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arxiv 1912.10500 v2 pith:6KILW3II submitted 2019-12-22 hep-lat hep-ph

classification hep-lathep-ph
keywords pointquarkcriticalreweightingfirst-orderheavymassparameter
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. First-order phase transitions in the heavy quark region of lattice QCD at high temperatures and high densities

    hep-lat 2025-01 conditional novelty 6.0 of 10

    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.

  2. The order of the chiral phase transition in massless many-flavour lattice QCD

    hep-lat 2025-01 conditional novelty 5.0 of 10

    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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