Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2000-05-10
Physics
High Energy Physics
High Energy Physics - Lattice
12 pages, 3 postscript figures Letter has been rewritten to reflect a reinterpretation of our results as indicating tricritica
Scientific paper
10.1016/S0370-2693(00)01050-9
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 $\beta_{mag}$, $\delta$ 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 $\sigma(f_0)$ mass above the transition, indicating the restoration of chiral symmetry.
Kogut John B.
Sinclair D. K.
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