Evidence for Scaling in Lattice QCD atβ=5.7

The SU(3) deconfinement temperature is studied on asymmetric lattices as a probe of scaling. For lattices with four sites in the temperature direction (${\beta }_c\approx 5.7$) we find precise agreement between the measured asymmetry dependence of the $\Lambda$ parameter and that predicted by one-loop perturbation theory. The agreement holds over a large range of asymmetry ($0.65<~\xi <~1.1$) and implies that violations of perturbative scaling above $\beta \approx 5.7$ are independent of asymmetry and therefore unlikely to be lattice artifacts. This provides evidence that the coupling range $5.7\lesssim \beta \lesssim 6.2$ is a regime of nonperturbative but universal scaling.