174 citations · 1.1k across the 52 of their papers we have counts for
5 papers · 1 filter
The eta-prime propagator in quenched QCD
W. Bardeen, A. Duncan, E. Eichten +2
The calculation of the eta-prime hairpin diagram is carried out in the modified quenched approximation (MQA) in which the lattice artifact which causes exceptional configurations i…
Resolving Exceptional Configurations
W. Bardeen, A. Duncan, E. Eichten +2
In lattice QCD with Wilson fermions, exceptional configurations arise in the quenched approximation at small quark mass. The origin of these large previously uncontrolled lattice a…
QED2 as a testbed for interpolations between quenched and full QCD
W. Bardeen, A. Duncan, E. Eichten +1
Lattice QED2 with the Wilson formulation of fermions is used as a convenient model system to study artifacts of the quenched approximation on a finite lattice. The quenched functio…
Quenched Approximation Artifacts: A study in 2-dimensional QED
W. Bardeen, A. Duncan, E. Eichten +1
The spectral properties of the Wilson-Dirac operator in 2-dimensional QED responsible for the appearance of exceptional configurations in quenched simulations are studied in detail…
Light Quarks, Zero Modes, and Exceptional Configurations
W. Bardeen, A. Duncan, E. Eichten +2
In continuum QCD, nontrivial gauge topologies give rise to zero eigenvalues of the massless Dirac operator. In lattice QCD with Wilson fermions, these zero modes appear as exactly…