Witten-Veneziano Relation, Quenched QCD, and Overlap Fermions

Details Witten-Veneziano Relation, Quenched QCD, and Overlap Fermions Witten-Veneziano Relation, Quenched QCD, and Overlap Fermions

2002-01-31

arxiv.org/abs/hep-lat/0202001v2

Phys.Rev.D65:114501,2002

Physics

High Energy Physics

High Energy Physics - Lattice

14 pages, Revtex, 11 postscript figures

Scientific paper

10.1103/PhysRevD.65.114501

The quarks in quenched QCD have an anomalous self-interaction in the flavor singlet Goldstone boson channel. This coupling is extracted from a graph with disconnected quark lines, and is used to infer the mass of the eta-prime meson in full QCD. When the fermions are described by an overlap action, the Witten-Veneziano relation is an exact relation between the topological susceptibility (as defined through fermionic zero modes) and the inferred value of the eta-prime mass. Using an overlap action we compute the hairpin amplitude and determine the fermion zero-mode susceptibility, the inferred eta-prime mass and other parameters characterizing the low energy chiral properties of quenched QCD.

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