Thermal QCD phase transition and its scaling window from Wilson twisted mass fermions
May 16, 2022
We investigate the thermal QCD phase transition and its scaling properties on the lattice.
The simulations are performed with $N_f=2+1+1$ Wilson twisted mass fermions at
pion masses from physical up to heavy quark regime. We introduce a novel chiral order parameter,
which is free from linear mass contributions and turns out to be very useful for
the study of scaling behaviour. Our results are compatible with $O(4)$ universal scaling for the physical pion mass
and the temperature range $[120:300]$ MeV. Violations to scaling at larger masses and other possible scenarios,
including mean field behaviour and $Z(2)$ scaling scenario are also discussed.
We provide an estimation for the critical temperature in the chiral limit $T_0$.
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