Anomalous Chiral Symmetry Breaking above the QCD Phase Transition
Shailesh Chandrasekharan, Dong Chen, Norman Christ, Weonjong Lee, Robert Mawhinney, Pavlos Vranas
Abstract
We study the anomalous breaking of UA(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 UA(1) symmetry breaking in the transition region. For the physical case of two flavors, we carry out extensive simulations on a 163 x 4 lattice, measuring a difference in susceptibilities which is sensitive to UA(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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