634 research outputs found
Tuning the Tadpole Improved Clover Wilson Action on Coarse Anisotropic Lattices
Wilson quark action, with tadpole improved clover term added, is studied on
coarse anisotropic lattices. The bare velocity of light parameter in this
action is determined non-perturbatively using the pseudo-scalar and vector
meson dispersion relations for various values of the gauge coupling and
bare quark mass parameter .Comment: 7 pages LateX, typeset with elsart.cls, 1 figure, 5 tables (4 more
tables added), 2 references adde
Scale Setting for Beyond Leading Order
We present a general procedure for applying the scale-setting prescription of
Brodsky, Lepage and Mackenzie to higher orders in the strong coupling constant
\alphas. In particular, we show how to apply this prescription when the
leading coefficient or coefficients in a series in \alphas are anomalously
small. We give a general method for computing an optimum scale numerically,
within dimensional regularization, and in cases when the coefficients of a
series are known. We find significant corrections to the scales for , , , and the ratios of
the quark pole to \MSbar and lattice bare masses.Comment: Lattice 2000 (Perturbation Theory), 5 pages, 7 figures, LaTe
Excitations of torelon
The excitations of gluonic flux tube in a periodic lattice are examined.
Monte Carlo simulations from an anisotropic lattice are presented and the
comparison with effective string models is discussed.Comment: Talk at Lattice 2003; 3 pages, 4 figure
The First Calculation for the Mass of the Ground Glueball State on Lattice
Under the quenched approximation, we perform a lattice calculation for the
mass of the ground glueball state in channel on a
lattice. Our calculation shows that the mass of this state is
, which rules out the or mainly
glueball interpretation for .Comment: 10 pages and 1 figur
F_B from moving B mesons
We show results for the B meson decay constant calculated both for B mesons
at rest and those with non-zero momentum and using both the temporal and
spatial components of the axial vector current. It is an important check of
lattice systematic errors that all these determinations of f_B should agree. We
also describe how well different smearings for the B meson work at non-zero
momentum - the optimal smearing has a narrow smearing for the b quark.Comment: Lattice2001(heavyquark
The QCD String Spectrum and Conformal Field Theory
The low energy excitation spectrum of the critical Wilson surface is
discussed between the roughening transition and the continuum limit of lattice
QCD. The fine structure of the spectrum is interpreted within the framework of
two-dimensional conformal field theory.Comment: Lattice2001 (confinement),3 pages,1 figure,uses espcrc2.st
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
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