Anomalous Chiral Symmetry Breaking above the QCD Phase Transition

Details Anomalous Chiral Symmetry Breaking above the QCD Phase Transition Anomalous Chiral Symmetry Breaking above the QCD Phase Transition

1998-07-08

arxiv.org/abs/hep-lat/9807018v1

Phys.Rev.Lett. 82 (1999) 2463-2466

Physics

High Energy Physics

High Energy Physics - Lattice

10 pages including 2 figures and 1 table

Scientific paper

10.1103/PhysRevLett.82.2463

We study the anomalous breaking of U_A(1) symmetry just above the QCD phase transition for zero and two flavors of quarks, using a staggered fermion, lattice discretization. The properties of the QCD phase transition are expected to depend on the degree of U_A(1) symmetry breaking in the transition region. For the physical case of two flavors, we carry out extensive simulations on a 16^3 x 4 lattice, measuring a difference in susceptibilities which is sensitive to U_A(1) symmetry and which avoids many of the staggered fermion discretization difficulties. The results suggest that anomalous effects are at or below the 15% level.

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