One-loop matching coefficients for improved staggered bilinears
Abstract
We calculate one-loop matching factors for bilinear operators composed of improved staggered fermions. We compare the results for different improvement schemes used in the recent literature, all of which involve the use of smeared links. These schemes aim to reduce, though not completely eliminate, O(a^2) discretization errors. We find that all these improvement schemes substantially reduce the size of matching factors compared to unimproved staggered fermions. The resulting corrections are comparable to, or smaller than, those found with Wilson and domain-wall fermions. In the best case (``Fat-7'' and mean-field improved HYP links) the corrections are 10 % or smaller at 1/a = 2 GeV.
Cite
@article{arxiv.hep-lat/0208018,
title = {One-loop matching coefficients for improved staggered bilinears},
author = {Weonjong Lee and Stephen R. Sharpe},
journal= {arXiv preprint arXiv:hep-lat/0208018},
year = {2009}
}
Comments
13 pages, 1 figure (misleading sentence in sec. II removed; version to appear in Physical Review D)