662 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
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
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 Heavy Hybrid Spectrum from NRQCD and the Born-Oppenheimer Approximation
The spectrum of heavy-quark hybrids is studied in the leading
Born-Oppenheimer (LBO) approximation and using leading-order NRQCD simulations
with an improved gluon action on anisotropic lattices. The masses of four
hybrid states are obtained from our simulations for lattice spacings 0.1 fm and
0.2 fm and are compared to the LBO predictions obtained using
previously-determined glue-excited static potentials. The consistency of
results from the two approaches reveals a compelling physical picture for
heavy-quark hybrid states.Comment: LATTICE99(Heavy Quarks),3 pages,2 figures,uses espcrc2.st
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
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 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
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