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

Journal Article · Fri Jul 01 00:00:00 EDT 2005 · Phys.Rev.D72:074506,2005

DOI:https://doi.org/10.1103/PhysRevD.72.074506· OSTI ID:15020168

Becher, Thomas; Gamiz, Elvira; Melnikov, Kirill

We compute O(alpha{sub 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{sub 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.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 15020168
• Report Number(s): FERMILAB-PUB-05-317-T; arXiv eprint number hep-lat/0507033; TRN: US0700241
• Journal Information: Phys.Rev.D72:074506,2005, Journal Name: Phys.Rev.D72:074506,2005
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
FERMIONS
KAONS
QUARKS
UNITARITY
Lattice