QCD mesonic screening masses up to high temperatures
December 12, 2022
We discuss a strategy to study non-perturbatively QCD up to very high temperatures by Monte Carlo simulations on the lattice. It allows
not only the thermodynamic properties of the theory but also other interesting thermal features to be investigated. As a first concrete
application, we compute the flavour non-singlet mesonic screening masses and we present the results of Monte Carlo simulations at 12
temperatures covering the range from T $\sim$ 1 GeV up to $\sim$ 160 GeV in the theory with three massless quarks. On the one side, chiral symmetry
restoration manifests itself in our results through the degeneracy of the vector and the axial vector channels and of the scalar and the
pseudoscalar ones, and, on the other side, we observe a clear splitting between the vector and the pseudoscalar screening masses up to the
highest investigated temperature. A comparison with the high-temperature effective theory shows that the known one-loop order in the
perturbative expansion does not provide a satisfactory description of the non-perturbative data up to the highest temperature considered.
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