Speaker
Description
In the last years the non-perturbative predictions of QCD at temperatures up to the Electroweak scale have become accessible, thanks to a novel computational strategy that allows to define and efficiently simulate the thermal lattice theory at very high temperatures. The length scales over which the strong force is screened in the thermal medium are observables of primary interest in this context: they characterize the spatial structure of the quark-gluon plasma and are encoded in the screening masses. In this contribution we report a precise and in-depth study of the screening spectrum of QCD in multiple hadronic channels and Matsubara sectors for temperatures between 1 and 165 GeV, with particular emphasis on non-static mesonic modes which are studied for the first time. Comparison between the non-perturbative results and the known terms of the perturbative expansion, valid at asymptotically high temperature, reveals that higher-order terms (some of which of non-perturbative origin) remain relevant over the whole temperature range. These results directly highlight the importance of a non-perturbative treatment of non-static observables in thermal QCD up to Electroweak scale temperatures.