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We study the scaling properties of the finite temperature QCD phasetransition, for light quark masses ranging from the heavy quark regime to theirphysical values. The lattice results are obtained in the fixed scale approachfrom simulations of $N_f=2+1+1$ flavours of Wilson fermions at maximal twist.We identify an order parameter free from the the linear contributions in massdue to additive renormalization and regular terms in the Equation of State,which proves useful for the assessment of the hypothesized universal behaviour.We find compatibility with the 3D $O(4)$ universality class for the physicalpion mass and temperatures $120$ MeV $ \lesssim T \lesssim 300$ MeV. We discussviolation of scaling at larger masses and a possible cross-over to mean fieldbehaviour. The chiral extrapolation $T_0 = 134^{+6}_{-4}$ MeV of thepseudocritical temperature is robust against predictions of differentuniversality classes and consistent with its estimate from the $O(4)$ Equationof State for the physical pion mass.

QCD transition at the physical point, and its scaling window from twisted mass Wilson fermions