The QCD transition temperature: results with physical masses in the continuum limit II

Abstract

We extend our previous study [Phys. Lett. B643 (2006) 46] of the crossover temperatures (T c ) of QCD. We improve our zero temperature analysis by using physical quark masses and finer lattices. In addition to the kaon decay constant used for scale setting we determine four quantities (masses of the Ω baryon, K * (892) and φ(1020) mesons and the pion decay constant) which are found to agree with experiment. This implies that -independently of which of these quantities is used to set the overall scale-the same results are obtained within a few percent. At finite temperature we use finer lattices down to a < ∼ 0.1 fm (N t = 12 and N t = 16 at one point). Our new results confirm completely our previous findings. We compare the results with those of the 'hotQCD' collaboration.

Entropic destruction of heavy quarkonium in non-Abelian plasma from holography

“…Indeed, the recent lattice study of the equation of state in (2 + 1) flavor QCD by the HotQCD Collaboration [15] indicates that the deconfinement and chiral restoration transitions occur at the temperature 145 MeV < T < 163 MeV, consistent with the earlier results from [16,17]. In the middle of the crossover region at T c = 155 MeV the entropy density of the plasma is s c = (5.34± 5 which is three times smaller than the additional entropy S ∞ (T = T c ) 16.5 [14] associated with the static quark-antiquark pair.…”

“…One can observe that the gross features of the L-dependence -increase with L followed by a saturation at some critical distance -are captured by our approach, even though the detailed shape is not reproduced. In the confining Yang-Mills theory at temperatures above the deconfinement transition the dependence of the entropy on inter-quark distance is similar, with a somewhat steeper growth at small L, see (17). The growth of the entropy with the distance in our approach is responsible for the entropic force (1) that tends to destroy the bound quark-antiquark states.…”

Lattice QCD: bulk and transport properties of QCD matter

“…Such results have been obtained by the WB collaboration from imaginary µ B simulations: c 2 , ...c 6 have been fitted on the µ B −derivatives of p/T 4 for fixed temperature [19]. At µ B = 0, the QCD phase transition is an analytic crossover [20]; a pseudocritical temperature T c can be defined by looking at the inflection point or peak of some specific observables [21,22,23,24]. One can follow the change in their position as the chemical potential increases: this gives rise to a µ B −dependence of T c which can be expressed as:…”

Fluctuations of conserved charges at finite temperature from lattice QCD

“…For details about the simulation algorithm, renormalization and a discussion on the cut-off effects we refer the reader to [16,20]. # trajectories N t = 6 N t = 8 N t =10 N t =12 N t =16 Figure 1.…”