2022/09/29 by Gert Aarts, Aarts, Gert, Chris Allton +27 · 3 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2209.14681
openalex publication_date 2022/09/29 · openalex created_date 2022/10/01 · openalex updated_date 2026/07/28
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 \(Nf = 2 +1 \) flavour Degenerate up and down quarks, approximately physical strange quark spatial lattice spacing \(as\) ~0.112 fm temporal lattice spacing \(at\) ~0.033 fm anisotropy \(ν = as / at\) ~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 \(mπ ∼ 239\) 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 \(γf\) is obtained by \(γf = γg / ν\). 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 \(β = 1.5\) tree-level coefficients \(c0 = 5/3, c2=-1/12\) bare gauge, fermion anisotropy \(γg = 4.3, γf = 3.399\) ratio of bare anisotropies \(ν = γg / γf = 1.265\) spatial tadpole (without, with smeared links) \(us = 0.733566, us = 0.92674\) temporal tadpole (without, with smeared links) \(uτ =1, uτ =1\) stout smearing for spatial links isotropic, 2 steps, \(ρ = 0.14\) bare light quark mass \(m0l = -0.0860\) bare strange quark mass \(ms0 = -0.0743\) light quark hopping parameter \(κlight = 0.27831\) strange quark hopping parameter \(κstrange = 0.2765\) The available ensembles are detailed in the below table \(Nτ\) 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 \(T / Tc\) 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 \(Ncfg\) 1024 1041 1042 1123 1102 1119 1090 1031 1016 1030 1102 1267 1048 The ensembles marked by * also have ~100 configurations at \(NS = 48\). 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 @articlePhysRevD.105.034504, title = Properties of the QCD thermal transition with Nf=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 @articleAarts:2022krz, author = Aarts, Gert and Allton, Chris and Bignell, Ryan and Burns, Timothy J. and Garc'\ia-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/