One-loop matching of Delta S=2 four-quark operators with improved staggered fermions

Thomas Becher; Elvira Gamiz; Kirill Melnikov

doi:10.1103/PhysRevD.72.074506

One-loop matching of Delta S=2 four-quark operators with improved staggered fermions

High Energy Physics - Lattice 2008-11-26 v1 High Energy Physics - Phenomenology

Authors: Thomas Becher , Elvira Gamiz , Kirill Melnikov

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Abstract

We compute O(alpha_s) lattice-to-continuum perturbative matching coefficients for the Delta S=2 flavor changing four-quark operators for the Asqtad improved staggered action. In conjunction with lattice simulations with three flavors of light, dynamical quarks, our results yield an unquenched determination of B_K, the parameter that determines the amount of indirect CP violation in the neutral kaon system. Its value is an important input for the unitarity triangle analysis of weak decays.

Keywords

four-quark operators staggered fermions perturbative matching B_K parameter CP violation lattice QCD

Cite

@article{arxiv.hep-lat/0507033,
  title  = {One-loop matching of Delta S=2 four-quark operators with improved staggered fermions},
  author = {Thomas Becher and Elvira Gamiz and Kirill Melnikov},
  journal= {arXiv preprint arXiv:hep-lat/0507033},
  year   = {2008}
}

Comments

11 pages, 2 figures

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