59 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
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
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
The glueball spectrum from an anisotropic lattice study
The spectrum of glueballs below 4 GeV in the SU(3) pure-gauge theory is
investigated using Monte Carlo simulations of gluons on several anisotropic
lattices with spatial grid separations ranging from 0.1 to 0.4 fm. Systematic
errors from discretization and finite volume are studied, and the continuum
spin quantum numbers are identified. Care is taken to distinguish single
glueball states from two-glueball and torelon-pair states. Our determination of
the spectrum significantly improves upon previous Wilson action calculations.Comment: 14 pages, 8 figures, uses REVTeX and epsf.sty (final version
published in Physical Review D
Excited states in lattice QCD with the stochastic LapH method
Progress in computing the spectrum of excited baryons and mesons in lattice
QCD is described. Results in the zero-momentum bosonic I=1/2, S=1, T1u symmetry
sector of QCD using a correlation matrix of 58 operators are presented. All
needed Wick contractions are efficiently evaluated using a stochastic method of
treating the low-lying modes of quark propagation that exploits Laplacian
Heaviside quark-field smearing. Level identification using probe operators is
discussed.Comment: 4 pages, 3 figures, talk presented at the 13th International
Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU
2013), Sept 30 - Oct 4, 2013, Rome, Ital
The Heavy Quark Self-Energy in Nonrelativistic Lattice QCD
The heavy quark self-energy in nonrelativistic lattice QCD is calculated to
in perturbation theory. An action which includes all
spin-independent relativistic corrections to order , where is the
typical heavy quark velocity, and all spin-dependent corrections to order
is used. The standard Wilson action and an improved multi-plaquette action are
used for the gluons. Results for the mass renormalization, wavefunction
renormalization, and energy shift are given; tadpole contributions are found to
be large. A tadpole improvement scheme in which all link variables are rescaled
by a mean-field factor is also studied. The effectiveness of this scheme in
offsetting the large tadpole contributions to the heavy quark renormalization
parameters is demonstrated.Comment: 28 pages, SLAC-PUB-598
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