Testing the strength of the ${\text{U}}_A(1)$ anomaly at the chiral phase transition in two-flavour QCD

Abstract

We study the thermal transition of QCD with two degenerate light flavours by lattice simulations using $\mathcal{O}(a)$-improved Wilson quarks. Particular emphasis lies on the pattern of chiral symmetry restoration, which we probe via the static screening correlators. On $32^3$ volumes we observe that the screening masses in transverse iso-vector vector and axial-vector channels become degenerate at the transition temperature. The splitting between the screening masses in iso-vector scalar and pseudoscalar channels is strongly reduced compared to the splitting at zero temperature and is actually consistent with zero within uncertainties. In this proceedings article we extend our studies to matrix elements and iso-singlet correlation functions. Furthermore, we present results on larger volumes, including first results at the physical pion mass.

10 pages, 9 figures, invited contribution to the 9th International Workshop on Chiral Dynamics, Sept. 17-21, 2018, Duke University, Durham, NC, USA

References in corpus (8)

• Finite volume QCD at fixed topological charge
• Meson screening masses from lattice QCD with two light and the strange quark
• Microscopic Origin of \boldmath{$U_A(1)$} Symmetry Violation in the High Temperature Phase of QCD
• Comparison of the mass preconditioned HMC and the DD-HMC algorithm for two-flavour QCD
• Effects of near-zero Dirac eigenmodes on axial U(1) symmetry at finite temperature
• Towards the N_f=2 deconfinement transition temperature with O(a) improved Wilson fermions
• Axial U(1) symmetry at finite temperature with Möbius domain-wall fermions
• QCD thermodynamics with two flavours of Wilson fermions on large lattices

Cited by in corpus (1)

• Chiral Susceptibility in (2+1)-flavour QCD