0000000000934748

AUTHOR

R. J. Tweedie

showing 2 related works from this author

Kl3Semileptonic Form Factor from (2+1)-Flavor Lattice QCD

2008

We present the first results for the ${K}_{l3}$ form factor from simulations with $2+1$ flavors of dynamical domain wall quarks. Combining our result, namely, ${f}_{+}(0)=0.964(5)$ with the latest experimental results for ${K}_{l3}$ decays leads to $|{V}_{us}|=0.2249(14)$, reducing the uncertaintity in this important parameter. For the $O({p}^{6})$ term in the chiral expansion we obtain $\ensuremath{\Delta}f=\ensuremath{-}0.013(5)$.

QuarkPhysicsQuantum chromodynamicsParticle physics010308 nuclear & particles physicsCabibbo–Kobayashi–Maskawa matrixLattice field theoryForm factor (quantum field theory)General Physics and AstronomyLattice QCD01 natural sciencesDomain wall (magnetism)Lattice gauge theory0103 physical sciences010306 general physicsPhysical Review Letters
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Kl3form factor withNf= 2 +1 dynamical domain wall fermions

2008

We present the latest results from the UKQCD/RBC collaborations for the Kl3 form factor from simulations with 2 + 1 flavours of dynamical domain wall quarks. Simulations are performed on lattices with two different volumes and four values of the light quark mass, allowing for an extrapolation to the chiral limit. The analysis includes a thorough investigation into the sources of systematic error in our fits. After interpolating to zero momentum transfer, we obtain f+(0) = 0.964(5) (or ?f = -0.013(5)) which, when combined with the latest experimental results for Kl3 decays, leads to |Vus| = 0.2249(14).

QuarkPhysicsHistoryParticle physicsCabibbo–Kobayashi–Maskawa matrixHigh Energy Physics::LatticeMomentum transferLattice field theoryExtrapolationForm factor (quantum field theory)FermionComputer Science ApplicationsEducationDomain wall (string theory)Journal of Physics: Conference Series
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