Properties of the QCD thermal transition with $N_f=2+1$ flavours of Wilson quark

Abstract

We study properties of the thermal transition in QCD, using anisotropic, fixed-scale lattice simulations with N f = 2 + 1 flavours of Wilson fermion. Observables are compared for two values of the pion mass, focusing on chiral properties. Results are presented for the Polyakov loop, various susceptibilities, the chiral condensate and its susceptibility, and the onset of parity doubling in the light and strange baryonic sector.

A comparison of spectral reconstruction methods applied to non-zero temperature NRQCD meson correlation functions

“…The simulation is performed with 2+1 dynamical Wilson-clover quark flavours where the pion mass is M π = 236(2) MeV. There are O(1000) configurations for all temperatures and the pseudocritical temperature is 162(1) MeV, as measured from the inflection point of the renormalised chiral condensate [8]. The temperatures and corresponding N τ values are shows in Table 1.…”

“…The temperatures and corresponding N τ values are shows in Table 1. 1: Temporal lattice sizes and corresponding temperatures for the fastsum Generation 2L ensembles [8]. The N τ = 128 ensemble was kindly provided by the Hadron Spectrum Collaboration [5][6][7].…”

Reconstruction of bottomonium spectral functions in thermal QCD using Kernel Ridge Regression

“…For the finite-temperature study, we use the anisotropic F Generation 2L ensembles, with 𝑁 𝑓 = 2 + 1 flavours of clover-improved Wilson fermions, see Ref. [12]. The light quarks are heavier than in nature, but the strange quark mass is at its physical value.…”

“…Parameters relevant for the ensembles: 𝑎 𝑠 (𝑎 𝜏 ) is the spatial (temporal) lattice spacing; 𝜉 is the renormalised anisotropy; 𝑁 𝑠 is the number of points in the spatial direction; 𝑚 𝜋 is the mass of the pion; 𝑇 pc is the pseudocritical temperature, obtained from the inflection point of the renormalised chiral condensate[12].…”

Meson thermal masses at different temperatures

“…We use the anisotropic FASTSUM ensembles described in detail in Ref. [5], with 𝑁 𝑓 = 2 + 1 flavours of clover-improved Wilson fermions. The strange quark mass is at its physical value [4], but the light quarks are heavier than in nature.…”