Probing the Region of Massless Quarks in Quenched Lattice QCD using Wilson Fermions
Robert G. Edwards, Urs M. Heller, Rajamani Narayanan, Robert L. Singleton
Abstract
We study the spectrum of H(m)=γ5 W(-m) with W(m) being the Wilson-Dirac operator on the lattice with bare mass equal to m. The background gauge fields are generated using the SU(3) Wilson action at β=5.7 on an 83× 16 lattice. We find evidence that the spectrum of H(m) is gapless for 1.02 < m < 2.0, implying that the physical quark is massless in this whole region.
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