CERN Accelerating science

Article
Report number	arXiv:2112.06662 ; CERN-TH-2021-206
Title	Computation of QCD meson screening masses at high temperature
Author(s)	Laudicina, Davide (Milan Bicocca U. ; INFN, Milan Bicocca) ; Dalla Brida, Mattia (CERN) ; Giusti, Leonardo (Milan Bicocca U. ; INFN, Milan Bicocca) ; Harris, Tim (Edinburgh U.) ; Pepe, Michele (INFN, Milan Bicocca)
Publication	2022-05-16
Imprint	2021-12-13
Number of pages	8
Note	8 pages, 4 figures, contribution to the 38th International Symposium on Lattice Field Theory, 26th-30th July 2021, Massachusetts Institute of Technology, USA
In:	PoS LATTICE2021 (2022) 190
In:	38th International Symposium on Lattice Field Theory, Online, 26 - 30 Jul 2021, pp.190
DOI	10.22323/1.396.0190
Subject category	nucl-th ; Nuclear Physics - Theory ; hep-ph ; Particle Physics - Phenomenology ; hep-ex ; Particle Physics - Experiment ; hep-lat ; Particle Physics - Lattice
Abstract	We compute flavor non-singlet meson screening masses in the chiral limit of QCD with $N_f=3$ quarks. The calculation is carried out at 12 temperatures from $T\approx 1$ GeV up to the electroweak scale. For each temperature we simulated several lattice spacings, so as to be able to perform the continuum limit extrapolation with confidence at a few permille accuracy. In the entire range of temperatures explored, the meson screening masses deviate from the free theory result $2\pi T$ by at most a few percent. Their values, however, cannot be explained by one-loop perturbation theory up to the electroweak scale, where the pseudoscalar and the vector screening masses are still significantly different within our precision. Chiral symmetry restoration manifests itself through the degeneracy of the pseudoscalar and the scalar channels and of the vector and the axial ones.
Copyright/License	preprint: © 2021-2025 the author(s) (License: CC BY-NC-ND 4.0) publication: © 2022-2025 the author(s) (License: CC-BY-NC-ND-4.0)

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