71 research outputs found
Perturbative Matching of the NRQCD Heavy-Light Axial Current
A one-loop matching calculation between Lattice NRQCD and full QCD for the
heavy-light axial current is described and the effects on f_B are discussed.Comment: Talk presented at Lattice '97, Edinburgh, July 1997. 3 LaTeX pages
plus 2 postscript figures. Uses espcrc2.st
Perturbative Matching of Heavy-Light Currents with NRQCD Heavy Quarks
We present further results for one-loop matching of heavy-light axial and
vector currents between continuum QCD and a lattice theory with NRQCD heavy
quarks and massless clover quarks.Comment: LATTICE98(heavyqk
Matching lattice and continuum axial-vector and vector currents with nonrelativistic QCD and highly improved staggered quarks
We match the continuum and lattice axial-vector and vector currents at one loop in perturbation theory. For the heavy quarks we use the nonrelativistic QCD (NRQCD) action and for the light quarks the highly improved staggered quark (HISQ) action. We present results for both massless and massive HISQ quarks and as part of the matching procedure we include a discussion of the one loop HISQ renormalization parameters. DOI: 10.1103/PhysRevD.87.03401
form factors from lattice QCD
We report the first lattice QCD calculation of the form factors for the
standard model tree-level decay . In combination with future
measurement, this calculation will provide an alternative exclusive
semileptonic determination of . We compare our results with previous
model calculations, make predictions for differential decay rates and branching
fractions, and predict the ratio of differential branching fractions between
and . We also present standard model
predictions for differential decay rate forward-backward asymmetries,
polarization fractions, and calculate potentially useful ratios of
form factors with those of the fictitious decay. Our lattice
simulations utilize NRQCD and HISQ light quarks on a subset of the MILC
Collaboration's asqtad gauge configurations, including two lattice
spacings and a range of light quark masses.Comment: 24 pages, 21 figures; Ver. 2 matches published versio
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