![]() Yin, Chiral susceptibility in (2 1) -flavor QCD, Phys. Vicari, Relevance of the axial anomaly at the finite-temperature chiral transition in QCD, Phys. Vicari, On the nature of the finite temperature transition in QCD, JHEP 08 (2003) 029. Sanielevici, Can the chiral transition in QCD be described by a linear σ model in three-dimensions?, Phys. Wilczek, Remarks on the chiral phase transition in chromodynamics, Phys. Sciarra, Deconfinement critical point of lattice QCD with N f = 2 Wilson fermions, Phys. WHOT-QCD collaboration, End point of the first-order phase transition of QCD in the heavy quark region by reweighting from quenched QCD, Phys. Boyd et al., Thermodynamics of SU(3) lattice gauge theory, Nucl. Brown et al., On the existence of a phase transition for QCD with three light quarks, Phys. Ioffe eds., World Scientific, Singapore (2000). Wilczek, The condensed matter physics of QCD, in At the frontier of particle physics. Szabo, The order of the quantum chromodynamics transition predicted by the standard model of particle physics, Nature 443 (2006) 675. ![]() We discuss a modified Columbia plot and a phase diagram for many-flavour QCD that reflect these possible features. We report on a comprehensive ongoing study using unimproved staggered fermions with N f ∈ mass-degenerate flavours on N τ ∈ \)( a)-improved N f = 3 Wilson data on N τ ∈ is also consistent with tricritical scaling, and the associated change from first to second-order on the way to the continuum chiral limit. The nature of the QCD chiral phase transition in the limit of vanishing quark masses has remained elusive for a long time, since it cannot be simulated directly on the lattice and is strongly cutoff-dependent. ![]()
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