Neutral kaon mixing parameter B{sub K} from unquenched mixed-action lattice QCD

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.014507· OSTI ID:21408988

Aubin, C ^[1]; Laiho, Jack ^[2]; Van de Water, Ruth S ^[3]

---

1. Department of Physics, College of William and Mary, Williamsburg, Virginia 23187 (United States)
2. Physics Department, Washington University, St. Louis, Missouri 63130 (United States)
3. Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)

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_equal}0.12 fm and a{approx_equal}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,NDR}(2 GeV)=0.527(6)(21), where the first error is statistical and the second is systematic.

• OSTI ID: 21408988
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 1; Other Information: DOI: 10.1103/PhysRevD.81.014507; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRALITY
COMPUTERIZED SIMULATION
FLAVOR MODEL
KAONS NEUTRAL
LATTICE FIELD THEORY
MASS
MIXING
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
QUARKS
BOSONS
COMPOSITE MODELS
CONSTRUCTIVE FIELD THEORY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRONS
KAONS
MATHEMATICAL MODELS
MESONS
PARTICLE MODELS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
QUARK MODEL
SIMULATION
STRANGE MESONS
STRANGE PARTICLES