647 research outputs found
The Charmonium Spectrum on the Lattice: A Status Report
We present our most recent results on the charmonium spectrum using
relativistic Wilson fermions. We study the dependence of the spectrum on the
charm quark mass and the Wohlert-Sheikholeslami improvement term.Comment: 4 pages, LaTeX, 5 figures (eps), needs espcrc2.sty, epsf.sty.
FERMILAB-CONF-92/330-
First results from the asymmetric O(a) improved Fermilab action
We present first results from calculations using O(a) improved (FNAL)
space-time asymmetric action on a 12^3 x 24 quenched lattice at \beta = 5.7 and
c_SW = 1.57. The asymmetry parameter is determined non-perturbatively from the
energy-momentum dispersion relation. This improvement scheme is mass dependent,
and the calculations have been done in the charm and bottom quark mass sectors
since it is at these heavier masses that the asymmetry is expected to be
relevant.Comment: 3 pp. LaTeX2e, 6PostScript figures, uses espcrc2.sty. Contribution to
Lattice99 (Pisa) proceedings (Improvement and Renormalisation
B -> pi l nu at three lattice spacings
The increasing accuracy of experimental results for the exclusive,
semileptonic decay B -> pi l nu requires a similarly accurate calculation of
the hadronic matrix elements, to determine |Vub|. We present preliminary
results for the form factors of the B to light meson decay mode. Using results
from three lattices in the range 5.7 <= beta <= 6.1 we study the dependence on
the lattice spacing.Comment: LATTICE98(heavyqk), LaTeX, 3 pages, 4 postscript figures, uses
espcrc2.st
Estimated Errors in |Vcd|/|Vcs| from Semileptonic D Decays
We estimate statistical and systematic errors in the extraction of the CKM
ratio |Vcd|/|Vcs| from exclusive D-meson semileptonic decays using lattice QCD
and anticipated new experimental results.Comment: LATTICE98(heavyqk), LaTeX, 3 pages, 2 postscript figures, uses
espcrc2.sty and hyperbasics.te
matching coefficients for axial vector current and 2 operator
We present a calculation of the perturbative matching coefficients including
mixing with higher dimensional operators for the temporal component of the
heavy-light axial current, , and the operator, . For
, calculations with various RG-improved
gauge actions are peformed. Matching coefficients with NRQCD and heavy-clover
actions are also compared.Comment: LATTICE99 (Heavy Quarks), 3 pages, 2 figures, espcrc2.st
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