One-loop matching ofΔS=2four-quark operators with improved staggered fermions

2005/07/22 by Thomas Becher, E. Gámiz, Elvira Gamiz +1
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-lat #hep-ph

paper · pdf · doi:10.1103/physrevd.72.074506

published as Phys.Rev.D72:074506,2005 · 11 pages, 2 figures

arxiv created 2005/07/22 · openalex publication_date 2005/10/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We compute O(\ensuremathα_s) lattice-to-continuum perturbative matching coefficients for the \ensuremathΔS=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.

Citations

• Matrix elements of four-fermion operators with quenched Wilson fermions
• CP violation and the CKM matrix: assessing the impact of the asymmetric B factories
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)