English

One-loop matching of improved four-fermion staggered operators with an improved gluon action

High Energy Physics - Lattice 2011-05-19 v2 High Energy Physics - Phenomenology

Abstract

We present results for one-loop matching factors of four-fermion operators composed of HYP-smeared staggered fermions. We generalize previous calculations by using the tree-level improved Symanzik gauge action. These results are needed for our companion numerical calculation of BKB_K and related matrix elements. We find that the impact on one-loop matching factors of using the improved gluon action is much smaller than that from the use of either HYP smearing or mean-field improvement. The one-loop coefficients for mean-field improved, HYP-smeared operators with the Symanzik gauge action have a maximum magnitude of O(1)×αsO(1)\times \alpha_s, indicating that perturbation theory is reasonably convergent.

Keywords

Cite

@article{arxiv.1102.1774,
  title  = {One-loop matching of improved four-fermion staggered operators with an improved gluon action},
  author = {Jongjeong Kim and Weonjong Lee and Stephen R. Sharpe},
  journal= {arXiv preprint arXiv:1102.1774},
  year   = {2011}
}

Comments

11 pages, 16 figures, references are updated