FASTSUM Generation 2 Anisotropic Thermal Lattice QCD Gauge Ensembles

FASTSUM Generation 2 Anisotropic Thermal Lattice QCD Gauge Ensembles The FASTSUM collaboration [1] Generation 2 Ensembles are lattice Quantum Chromodynamics (QCD) gauge-ensembles used extensively to examine thermal (non-zero temperature) properties of QCD using the first principles methods of lattice QCD. These are anisotropic lattices using the `fixed-scale` approach to thermal ensembles wherein the temperature is changed entirely by changing the number of points in the temporal direction. These ensembles are freely available (see below). The only requirements of use are that this Zenodo page, and the two papers detailing the ensembles, Electrical conductivity and charge diffusion in thermal QCD from the lattice and Properties of the QCD thermal transition with Nf=2+1 flavors of Wilson quark are appropriately cited. These ensembles are characterised by \(N_f = 2 +1 \) flavour Degenerate up and down quarks, physical strange quark spatial lattice spacing \(a_s\) ~0.12 fm temporal lattice spacing \(a_t\) ~0.035 fm anisotropy \(\nu = a_s / a_t\) ~3.444 Number of spatial sites NS NS = 24 or 32 Number of Temporal sites NT in [16, 48] Temperatures 117 MeV to 352 MeV Pseudocritical temperature (from renormalised chiral condensate) 181(1) MeV Pion mass \(m_\pi \sim 384\) MeV Pseudoscalar to vector mass ratio \( M_\pi / M_\rho \sim 0.446\) This choice action and bare parameters follows that of the Hadron Spectrum Collaboration https://doi.org/10.1103/PhysRevD.78.054501, namely a Symanzik improved gauge action and a tadpole improved Wilson-clover fermion action with stout-smeared links. The main parameters in the lattice action are listed below. The bare fermion anisotropy \(\gamma_f\) is obtained by \(\gamma_f = \gamma_g / \nu\). Full details may be found in Electrical conductivity and charge diffusion in thermal QCD from the lattice and Properties of the QCD thermal transition with Nf=2+1 flavors of Wilson quark which are also attached to this Zenodo record. gauge coupling \(\beta = 1.5\) tree-level coefficients \(c_0 = 5/3,\, c2=-1/12\) bare gauge, fermion anisotropy \(\gamma_g = 4.3,\, \gamma_f = 3.399\) ratio of bare anisotropies \(\nu = \gamma_g / \gamma_f = 1.265\) spatial tadpole (without, with smeared links) \(u_s = 0.733566, \tilde{u}_s = 0.92674\) temporal tadpole (without, with smeared links) \(u_\tau =1, \tilde{u}_\tau =1\) stout smearing for spatial links isotropic, 2 steps, \(\rho = 0.14\) bare light quark mass \(m_0^l = -0.0840\) bare strange