Tricritical scaling at the N{sub t} = 6 chiral phase transition for 2 flavour lattice QCD with staggered quarks.
We have simulated lattice QCD directly in the chiral limit of zero quark mass by adding an additional, irrelevant 4-fermion interaction to the standard action. Using lattices having temporal extent of six and spatial extents of twelve and eighteen, we find that the theory with 2 massless staggered quark flavors has a second-order finite-temperature phase transition. The critical exponents {beta}{sub mag}, {delta} and {nu} are measured and favour tricritical behaviour over that expected by universality arguments. The pion screening mass is consistent with zero below the transition, but is degenerate with the nonzero {sigma}(f{sub 0}) mass above the transition, indicating the restoration of chiral symmetry.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 961068
- Report Number(s):
- ANL-HEP-PR-00-049; PYLBAJ; TRN: US1003249
- Journal Information:
- Phys. Lett. B, Vol. 492, Issue 2000; ISSN 0370-2693
- Country of Publication:
- United States
- Language:
- ENGLISH
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