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14 papers · 2 filters
Quark propagator from an improved staggered action in Laplacian and Landau gauges
P. O. Bowman, U. M. Heller, A. G. Williams
Studies of gauge dependent quantities are afflicted with Gribov copies, but Laplacian gauge fixing provides one possible solution to this problem. We present results for the lattic…
Probing the QCD vacuum with overlap fermions
Robert G. Edwards, Urs M. Heller
We use low lying eigenvectors of the overlap-Dirac operator as a probe of the QCD vacuum. If instantons play a significant role one would expect the low lying eigenmodes of the ove…
Lattice Quark Propagator in Landau and Laplacian Gauges
P. O. Bowman, U. M. Heller, A. G. Williams
We present results for the lattice quark propagator in both Landau and Laplacian gauges using standard and improved staggered quark actions. The standard Kogut-Susskind action has…
Heavy-light decay constants with three dynamical flavors
C. Bernard, T. Burch, S. Datta +7
We present preliminary results for the heavy-light leptonic decay constants in the presence of three light dynamical flavors. We generate dynamical configurations with improved sta…
Thermodynamics with 3 and 2+1 Flavors of Improved Staggered Quarks
C. Bernard, T. Burch, S. Datta +7
We present preliminary results from exploring the phase diagram of finite temperature QCD with three degenerate flavors and with two light flavors and the mass of the third held ap…
Zero-modes of the QED Neuberger Dirac operator
Bernd A. Berg, Urs M. Heller, Harald Markum +2
We consider compact lattice QED in the quenched approximation. First, we briefly summarize the spectrum of the staggered Dirac operator and its connection with random matrix t…
Thermodynamics with 2+1 and 3 Flavors of Improved Staggered Quarks
C. Bernard, T. Burch, S. Datta +7
We present preliminary results from exploring the phase diagram of finite temperature QCD with three degenerate flavors and with two light flavors and the mass of the third held ap…
Patterns of Spontaneous Chiral Symmetry Breaking in Vectorlike Gauge Theories
P. H. Damgaard, U. M. Heller, R. Niclasen +1
It has been conjectured that spontaneous chiral symmetry breaking in strongly coupled vectorlike gauge theories falls into only three different classes, depending on the gauge grou…
Lattice results for the decay constant of heavy-light vector mesons
C. Bernard, P. Williams, S. Datta +7
We compute the leptonic decay constants of heavy-light vector mesons in the quenched approximation. The reliability of lattice computations for heavy quarks is checked by comparing…
The QCD spectrum with three quark flavors
Claude Bernard, Tom Burch, Thomas A. DeGrand +7
We present results from a lattice hadron spectrum calculation using three flavors of dynamical quarks - two light and one strange, and quenched simulations for comparison. These si…
Are Topological Charge Fluctuations in QCD Instanton Dominated?
Robert G. Edwards, Urs M. Heller
We consider a recent proposal by Horváth {\em et al.} to address the question whether topological charge fluctuations in QCD are instanton dominated via the response of fermions us…
Exact Zero-Modes of the Compact QED Dirac Operator
Bernd A. Berg, Urs M. Heller, Harald Markum +2
We calculate the low-lying eigenmodes of the Neuberger overlap-Dirac operator for compact lattice QED in the quenched approximation. In the strong coupling phase we find exact…
Zero temperature string breaking in lattice quantum chromodynamics
C. Bernard, T. DeGrand, C. DeTar +7
The separation of a heavy quark and antiquark pair leads to the formation of a tube of flux, or "string", which should break in the presence of light quark-antiquark pairs. This ex…
Infinite Volume and Continuum Limits of the Landau-Gauge Gluon Propagator
F. D. R. Bonnet, P. O. Bowman, D. B. Leinweber +2
We extend a previous improved action study of the Landau gauge gluon propagator, by using a variety of lattices with spacings from to 0.41 fm, to more fully explore fini…