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Symmetry of screening masses of mesons in two-flavor lattice QCD at high temperatures

Y. Aoki1, H. Fukaya2, S. Hashimoto3,4, I. Kanamori1, Y. Nakamura1, C. Rohrhofer2, K. Suzuki5, and D. Ward2 (JLQCD Collaboration)

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Phys. Rev. D 111, 114506 – Published 13 June, 2025

DOI: https://doi.org/10.1103/yh8j-q93c

Abstract

We investigate spatial two-point correlation functions of mesonic operators in two-flavor lattice QCD at high temperatures. The simulated temperatures cover the range T∈[147,330]  MeV, where the critical temperature is estimated around 165 MeV. To ensure a good control of the chiral symmetry we employ the Möbius domain-wall fermion action for two degenerate flavors of quarks. With a lattice cutoff a−1∼2.6  GeV, the residual mass is reduced to 0.14 MeV. With the energy spectrum obtained from the screening mass at incremental values of the temperature range, we examine the SU(2)L×SU(2)R chiral symmetry, the anomalous axial U(1), as well as an enhanced symmetry which exchanges the spin degrees of freedom. We also study how the data approaches the perturbative prediction given by twice the Matsubara frequency of free quarks.

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Phys. Rev. D 111, 114506– Published 13 June, 2025
  • Received 29 January 2025
  • Accepted 16 May 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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