475 research outputs found
The Improvement Program in Nonrelativistic Lattice QCD
Progress in the improvement program in nonrelativistic lattice QCD is
outlined. The leading radiative corrections to the heavy-quark mass
renormalization, energy shift, and two important kinetic coupling coefficients
are presented. The reliability of tadpole-improved perturbation theory in
determining the energy shift and mass renormalization is demonstrated.Comment: 3 pages in uuencoded-compressed-PostScript format, to appear in the
Proceedings of LATTICE 93, Dallas, USA, October 1993; Edinburgh Preprint
93/53
Lattice QCD meets experiment in hadron physics
We review recent results in lattice QCD from numerical simulations that allow
for a much more realistic QCD vacuum than has been possible before. Comparison
with experiment for a variety of hadronic quantities gives agreement to within
statistical and systematic errors of 3%. We discuss the implications of this
for future calculations in lattice QCD, particularly those which will provide
input for B factory experiments.Comment: Review talk at HADRON2003, Aschaffenberg, Germany, September 200
Perturbative Improvement for Lattice QCD: An Update
Recent developments in the Symanzik improvement program for lattice QCD are
reviewed.Comment: Invited talk at the workshop on "Lattice QCD on Parallel Computers"
(Tsukuba, March 1997). One file producing 12 pages; LaTe
Nonperturbative ``Lattice Perturbation Theory''
We discuss a program for replacing standard perturbative methods with Monte
Carlo simulations in short distance lattice gauge theory calculations.Comment: 3 pages, uuencoded Latex file, two embedded figures and .sty file
include
Moving NRQCD for B Form Factors at High Recoil
We derive the continuum and lattice tree-level moving NRQCD (mNRQCD) through
order 1/m^2. mNRQCD is a generalization of NRQCD for dealing with hadrons with
nonzero velocity u_mu. The quark's total momentum is written as P^mu=Mu^mu+k^mu
where k^mu << Mu^mu is discretized and Mu^mu is treated exactly. Radiative
corrections to couplings on the lattice are discussed. mNRQCD is particularly
useful for calculating B->pi and B->D form factors since errors are similar at
low and high recoil.Comment: 3 pages, 1 figure, Lattice2002(heavyquark
B_s Mesons using Staggered Light Quarks
Last year we proposed using staggered fermions as the light quarks, combined
with nonrelativistic heavy quarks, in simulations of heavy-light mesons. A
first round of tests which focuses on the B_s meson has been completed using
quenched lattices, and results are presented here for the kinetic B_s mass, the
B_s^* - B_s splitting, and f_{B_s}. The next project, already underway, is to
compute the B and B_s decay constants and spectra on the n_f = 2+1 and 3 MILC
lattices. We report on progress with one set of these configurations.Comment: Talk presented by M.W. at Lattice2002(heavyquark
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