Neutral Kaon Mixing Parameter BK from Unquenched Mixed-action Lattice

Journal Article · Thu Jan 21 04:00:00 EST 2010 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

OSTI ID:985815

Van de Water, R; Aubin, C; Laiho, J

We calculate the neutral kaon mixing parameter B{sub K} in unquenched lattice QCD using asqtad-improved staggered sea quarks and domain-wall valence quarks. We use the '2+1' flavor gauge configurations generated by the MILC Collaboration, and simulate with multiple valence and sea-quark masses at two lattice spacings of a {approx} 0.12 fm and a {approx} 0.09 fm. We match the lattice determination of B{sub K} to the continuum value using the nonperturbative method of Rome-Southampton, and extrapolate B{sub K} to the continuum and physical quark masses using mixed-action chiral perturbation theory. The 'mixed-action' method enables us to control all sources of systematic uncertainty and therefore to precisely determine B{sub K}; we find a value of B{sub K}{sup MS{sup -},NDR} (2 GeV) = 0.527(6)(21), where the first error is statistical and the second is systematic.

• Research Organization: BROOKHAVEN NATIONAL LABORATORY (BNL)
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 985815
• Report Number(s): BNL--93757-2010-JA; YN0100000
• Journal Information: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology Journal Issue: 1 Vol. 81; ISSN PRVDAQ; ISSN 1550-7998
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BK
CKM
CP
JLQCD
KAONS
PERTURBATION THEORY
QCD
QUANTUM CHROMODYNAMICS
QUARKS
RBC
SEAS
VALENCE
kaon
lattice
sea-quark
unquenched