FASTSUM Generation 2L Anisotropic Thermal Lattice QCD Gauge Ensembles The FASTSUM collaboration [1] Generation 2L 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 have a quark mass closer to physical than our earlier Generation 2 Ensembles. These ensembles are available (see below) for non-competing research. The requirements of this use are that this Zenodo page, and the two papers detailing the ensembles, Properties of the QCD thermal transition with Nf=2+1 flavors of Wilson quark and Open charm mesons at nonzero temperature: results in the hadronic phase from lattice QCD are appropriately cited. These ensembles are characterised by \(N_f = 2 +1 \) flavour Degenerate up and down quarks, approximately physical strange quark spatial lattice spacing \(a_s\) ~0.112 fm temporal lattice spacing \(a_t\) ~0.033 fm anisotropy \(\nu = a_s / a_t\) ~3.453 Number of spatial sites NS NS = 32 Number of Temporal sites NT in [8, 128] Temperatures 47 MeV to 760 MeV Pseudocritical temperature (from renormalised chiral condensate) 167(3) MeV Pion mass \(m_\pi \sim 239\) MeV 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 Properties of the QCD thermal transition with Nf=2+1 flavors of Wilson quark and Open charm mesons at nonzero temperature: results in the hadronic phase from lattice QCD which are also attached to this 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 \(m_0^l = -0.0860\) bare strange quark mass \(m^s_0 = -0.0743\) light quark hopping parameter \(\kappa_{light} = 0.27831\) strange quark hopping parameter \(\kappa_{strange} = 0.2765\) The available ensembles are detailed in the below table \(N_\tau\) 128 64 56 48 40 36 32 28 24* 20* 16* 12 8 \(T\) MeV 47 95 109 127 152 169 190 217 253 304 380 507 760 \(T / T_{c}\) 0.284 0.569 0.650 0.758 0.910 1.011 1.138 1.300 1.517 1.820 2.275 3.034 4.550 \(N_{cfg}\) 1024 1041 1042 1123 1102 1119 1090 1031 1016 1030 1102 1267 1048 The ensembles marked by * also have ~100 configurations at \(N_S = 48\). Sharing & Usage The ensembles are currently available for non-competing research. To enquire, please contact (preferably) the generic email address PhysicsByFASTSUM AT gmail DOT com or one of Chris Allton or Jon-Ivar Skullerud. If they are used, this Zenodo page and two papers detailing the ensembles, Properties of the QCD thermal transition with Nf=2+1 flavors of Wilson quark and Open charm mesons at nonzero temperature: results in the hadronic phase from lattice QCD must be appropriately cited, i.e. with bibtex @article{PhysRevD.105.034504, title = {Properties of the QCD thermal transition with ${N}_{f}=2+1$ flavors of Wilson quark}, author = {Aarts, G. and Allton, C. and Glesaaen, J. and Hands, S. and J\"ager, B. and Kim, S. and Lombardo, M. P. and Nikolaev, A. A. and Ryan, S. M. and Skullerud, J.-I. and Wu, L.-K.}, journal = {Phys. Rev. D}, eprint = "2007.04188", archivePrefix = "arXiv", primaryClass = "hep-lat", volume = {105}, issue = {3}, pages = {034504}, numpages = {12}, year = {2022}, month = {Feb}, publisher = {American Physical Society}, doi = {10.1103/PhysRevD.105.034504}, url = {https://link.aps.org/doi/10.1103/PhysRevD.105.034504}} and @article{Aarts:2022krz, author = {Aarts, Gert and Allton, Chris and Bignell, Ryan and Burns, Timothy J. and Garc\'\i{}a-Mascaraque, Sergio Chaves and Hands, Simon and J\"ager, Benjamin and Kim, Seyong and Ryan, Sin\'ead M. and Skullerud, Jon-Ivar}, title = "{Open charm mesons at nonzero temperature: results in the hadronic phase from lattice QCD}", eprint = "2209.14681", archivePrefix = "arXiv", primaryClass = "hep-lat", month = "9", year = "2022"} [1] https://fastsum.gitlab.io/