1,470 research outputs found
In search of a scaling scalar glueball
Anisotropic lattices are an efficient means of studying the glueballs of QCD,
however problems arise with simulations of the lightest, scalar state. The mass
is strongly dependent on the lattice spacing, even when a mean-field improved
gluon action is used. The nature and cause of these errors are discussed and
the scaling properties of the scalar from different lattice actions are
presented.Comment: LATTICE98(improvement
Improved gluonic actions on anisotropic lattices
The use of novel perturbatively-improved gluonic actions on anisotropic
lattices in which the temporal spacing is much smaller than that in the spatial
directions is discussed. Such actions permit more efficient measurements of
noisy correlation functions, such as glueball correlators, on coarse lattices.
A derivation of these actions at tree-level is outlined; mean-field link
renormalization plays a crucial role in their construction. Results for the
low-lying glueball masses and the heavy-quark potential are presented.Comment: 3 pages, 2 figures, uses espcrc2.sty and epsf.sty. Talk presented at
LATTICE96(improvement
Baryon spectroscopy on the lattice: recent results
Progress in determining the baryon spectrum using computer simulations of
quarks and gluons in lattice QCD are summarized and some future plans are
outlined.Comment: 5 pages, 4 figures, talk presented at the Conference on the
Intersections of Particle and Nuclear Physics, New York, NY, May 19-24, 2003,
submitted to American Institute of Physics Conference Proceedings. After
publication, it will be found at http://proceedings.aip.org/proceedings
Glueball Masses in Relativistic Potential Model
The problem of glueball mass spectra using the relativistic Dirac equation is
studied. Also the Breit-Fermi approach used to obtaining hyperfine splitting in
glueballs. Our approach is based on the assumption, that the nature and the
forces between two gluons are the short-range. We were to calculate the
glueball masses with used screened potential.Comment: 7 pages, LaTe
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
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