Perturbative matching of staggered four-fermion operators with hypercubic fat links
Abstract
We calculate the one-loop matching coefficients between continuum and lattice four-fermion operators for lattice operators constructed using staggered fermions and improved by the use of fattened links. In particular, we consider hypercubic fat links and SU(3) projected Fat-7 links, and their mean-field improved versions. We calculate only current-current diagrams, so that our results apply for operators whose flavor structure does not allow ``eye-diagrams''. We present general formulae, based on two independent approaches, and give numerical results for the cases in which the operators have the taste (staggered flavor) of the pseudo-Goldstone pion. We find that the one-loop corrections are reduced down to the 10-20% level, resolving the problem of large perturbative corrections for staggered fermion calculations of matrix elements.
Keywords
Cite
@article{arxiv.hep-lat/0306016,
title = {Perturbative matching of staggered four-fermion operators with hypercubic fat links},
author = {Weonjong Lee and Stephen Sharpe},
journal= {arXiv preprint arXiv:hep-lat/0306016},
year = {2009}
}
Comments
37 pages, no figure, 20 tables