Phys. Rev. Lett. 82, 2463–2466 (1999)

Anomalous Chiral Symmetry Breaking above the QCD Phase Transition

Abstract

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Shailesh Chandrasekharan^*, Dong Chen^†, Norman Christ, Weonjong Lee^‡, Robert Mawhinney, and Pavlos Vranas
Department of Physics, Columbia University, New York, New York 10027

Received 8 July 1998; published in the issue dated 22 March 1999

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 16³×4 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.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.82.2463

DOI:

10.1103/PhysRevLett.82.2463

PACS:

12.38.Gc, 11.30.Rd, 12.38.Mh

^*Present address: Department of Physics, Duke University, P.O. Box 90305, Durham, NC 27708.

^†Present address: CTP-LNS, Massachusetts Institute of Technology, Cambridge, MA 02139.

^‡Present address: MS-B285, T-8 Group, Theory Division, Los Alamos National Lab, Los Alamos, NM 87545.

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Phys. Rev. Lett. 82, 2463–2466 (1999)

Anomalous Chiral Symmetry Breaking above the QCD Phase Transition