Evidence for O(2) universality at the finite temperature transition for lattice QCD with 2 flavors of massless staggered quarks
- Department of Energy, Division of High Energy Physics, Washington D.C. 20585 (United States) and Department of Physics-TQHN, University of Maryland, 82 Regents Dr., College Park, Maryland 20742 (United States)
We simulate lattice QCD with 2 flavours of massless quarks on lattices of temporal extent N{sub t}=8, to study the finite temperature transition from hadronic matter to a quark-gluon plasma. A modified action which incorporates an irrelevant chiral 4-fermion interaction is used, which allows simulations at zero quark mass. We obtain excellent fits of the chiral condensates to the magnetizations of a 3-dimensional O(2) spin model on lattices small enough to model the finite size effects. This gives predictions for correlation lengths and chiral susceptibilities from the corresponding spin-model quantities. These are in good agreement with our measurements over the relevant range of parameters. Binder cumulants are measured, but the errors are too large to draw definite conclusions. From the properties of the O(2) spin model on the relatively small lattices with which we fit our data, we can see why earlier attempts to fit staggered lattice data to leading-order infinite-volume scaling functions, as well as finite size scaling studies, failed and led to erroneous conclusions.
- OSTI ID:
- 20782831
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 73, Issue 7; Other Information: DOI: 10.1103/PhysRevD.73.074512; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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