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

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

2005-07-22

arxiv.org/abs/hep-lat/0507033v1

Phys.Rev.D72:074506,2005

Physics

High Energy Physics

High Energy Physics - Lattice

11 pages, 2 figures

Scientific paper

10.1103/PhysRevD.72.074506

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.

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