We present a strategy to study QCD non-perturbatively on the lattice at very high temperatures. This strategy exploits a non-perturbative, finite-volume, definition of the strong coupling constant to renormalize the theory. As a first application we compute the flavor non-singlet mesonic screening masses in a wide range of temperature, from T ∼ 1 GeV up to ∼ 160 GeV with three flavors in the chiral limit of QCD. Our results show very interesting features of the screening spectrum at very high temperatures. On one hand the mass splitting between the vector and the pseudoscalar screening masses is clearly visible up to the electroweak scale and cannot be explained by the known 1-loop perturbative result. On the other hand the restoration of chiral symmetry manifests itself through the degeneracy of the pseudoscalar and the scalar channels and of the vector and the axial-vector ones. This degeneracy pattern is the one expected by Ward identities associated to the presence of chiral symmetry.

Laudicina, D., Dalla Brida, M., Giusti, L., Harris, T., Pepe, M. (2023). QCD mesonic screening masses and restoration of chiral symmetry at high T. In 39th International Symposium on Lattice Field Theory, LATTICE 2022. Sissa Medialab Srl [10.22323/1.430.0182].

QCD mesonic screening masses and restoration of chiral symmetry at high T

Laudicina, Davide
;
Dalla Brida, Mattia;Giusti, Leonardo;Harris, Tim;Pepe, Michele
2023

Abstract

We present a strategy to study QCD non-perturbatively on the lattice at very high temperatures. This strategy exploits a non-perturbative, finite-volume, definition of the strong coupling constant to renormalize the theory. As a first application we compute the flavor non-singlet mesonic screening masses in a wide range of temperature, from T ∼ 1 GeV up to ∼ 160 GeV with three flavors in the chiral limit of QCD. Our results show very interesting features of the screening spectrum at very high temperatures. On one hand the mass splitting between the vector and the pseudoscalar screening masses is clearly visible up to the electroweak scale and cannot be explained by the known 1-loop perturbative result. On the other hand the restoration of chiral symmetry manifests itself through the degeneracy of the pseudoscalar and the scalar channels and of the vector and the axial-vector ones. This degeneracy pattern is the one expected by Ward identities associated to the presence of chiral symmetry.
abstract + slide
Lattice QCD; Finite temperature
English
39th International Symposium on Lattice Field Theory, LATTICE 2022 - 8 August 2022 through 13 August 2022
2022
39th International Symposium on Lattice Field Theory, LATTICE 2022
2023
430
182
open
Laudicina, D., Dalla Brida, M., Giusti, L., Harris, T., Pepe, M. (2023). QCD mesonic screening masses and restoration of chiral symmetry at high T. In 39th International Symposium on Lattice Field Theory, LATTICE 2022. Sissa Medialab Srl [10.22323/1.430.0182].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/444579
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