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 artifacts is identified. A simple well-defined procedure (MQA) is presented which removes the artifacts while preserving the correct continuum limit.
@article{arxiv.hep-lat/9710084,
title = {Resolving Exceptional Configurations},
author = {W. Bardeen and A. Duncan and E. Eichten and G. Hockney and H. Thacker},
journal= {arXiv preprint arXiv:hep-lat/9710084},
year = {2008}
}
Comments
Talk presented by E. Eichten at Lattice 97, Edinburgh(UK), July97. 6 pages, LaTeX, 1 table, 5 figures