The Wroblewski parameter from lattice QCD

Abstract

I present our recent results on the critical end point in the µ B -T phase diagram of QCD with two flavours of light dynamical quarks and compare them with similar results from other groups. Implications for a possible energy scan at the RHIC are discussed. I also comment briefly on the new results of great relevance to heavy ion collisions from finite temperature lattice QCD simulations on speed of sound, specific heat and on the fate of J/ψ.

Global Properties of Nucleus–Nucleus Collisions

“…I.e. the value of λ s in A+A collisions at high √ s resembles that of a grand canonical QGP at µ b → 0, as was indeed shown in a 3 flavor lattice QCD calculation[105] at T ≈ T c . On the contrary, a p+p collision features no QGP but a small fireball volume, at T ≈ T c , within which local strangeness neutrality, s = s has to be strictly enforced, implying a canonical treatment[97].…”

Lattice QCD results on strangeness and quasi-quarks in heavy-ion collisions

“…It has been argued earlier [5] that under certain conditions, whose satisfaction can be verified by independent observations, one has λ s = C s/u . Our results for this robust quantity are shown in Figure 4 [19]. In this computation we have taken the strange quark mass to be m s = T c and the two light quark masses to be degenerate, m ud = 0.03T c , such that it reproduces the correct value of m π /m ρ .…”

Latent heat of the largeNfinite temperature phase transition

“…the coupling is not sufficiently small or L c sufficiently large to see continuum scaling. For comparison, consider the results [2] or [9] in non-reduced calculations. At N t values that are the same as the L c values used here, the scaling violations are also substantial and comparable to results shown here.…”