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

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.

arXiv comment11 pages, 2 figures

References in corpus (27)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories
• On the Viability of Lattice Perturbation Theory
• Flavor Symmetry and the Static Potential with Hypercubic Blocking
• The QCD spectrum with three quark flavors
• High-Precision Lattice QCD Confronts Experiment
• Variants of fattening and flavor symmetry restoration
• The 2004 UTfit Collaboration Report on the Status of the Unitarity Triangle in the Standard Model
• Aspects Of Heavy Quark Theory
• Flavor-Symmetry Restoration and Symanzik Improvement for Staggered Quarks
• B decay and the Upsilon mass
• The Complete |Delta S|=2 Hamiltonian in the Next-To-Leading Order
• Evanescent Operators, Scheme Dependences and Double Insertions
• Accurate Determinations of ${\alpha }_s$ from Realistic Lattice QCD
• Matrix Elements of 4-fermion Operators with Quenched Wilson Fermions
• Non-Abelian Dipole Radiation and the Heavy Quark Expansion
• Perturbative Corrections for Staggered Four-Fermion Operators
• One-loop matching coefficients for improved staggered bilinears
• Perturbative matching of staggered four-fermion operators with hypercubic fat links
• Perturbative renormalization factors for bilinear and four-quark operators for Kogut-Susskind fermions on the lattice
• Testing improved staggered fermions with $m_s$ and $B_K$
• The Asymptotic Expansion of Lattice Loop Integrals Around the Continuum Limit
• Status of Lattice Flavor Physics
• One Spin Trace Formalism for $B_K$
• On tadpole improvement for staggered fermions
• The self-energy of improved staggered quarks
• B_K from improved staggered quarks

Cited by in corpus (5)

• Unquenched determination of the kaon parameter B_K from improved staggered fermions
• The CP asymmetry in B^0(t) -> K_S π^0 γin the Standard Model
• The Kaon B-parameter in Mixed Action Chiral Perturbation Theory
• One-loop matching factors for staggered bilinear operators with improved gauge actions
• Quark mixing and CP violation - the CKM matrix