3,258 research outputs found
Casimir scaling or flux counting?
Potentials between two static sources in various representations of the SU(3)
gauge group are determined on anisotropic 3+1 dimensional lattices. Strong
evidence in favour of "Casimir scaling" is found.Comment: 4 pages Latex, epscrc2.sty with 2 epsf figure
Recent Developments in Lattice QCD
Recent trends in lattice QCD calculations and latest results are reviewed,
with particular emphasis on multiquark-states and the nucleon structure.Comment: Plenary Talk presented at European Few Body 19, 23-27 August 2004,
Groningen, 7 pages, 4 figure
Are there short distance non-perturbative contributions to the QCD static potential?
We find that perturbation theory fails to describe the short range static
potential as obtained from quenched lattice simulations, at least for source
separations r > 1/(6 GeV). The difference between the non-perturbatively
determined potential and perturbation theory at short distance is well
parameterised by a linear term with a slope of approximately 1.2 GeV^2 that is
significantly bigger than the string tension, sigma = 0.21 GeV^2Comment: 11 pages Latex, elsart style with 3 epsf figures, some figures and
formulas have changed due to a sign error in the original manuscript, Title
changed, typos corrected, references update
The DsJ(2317): what can the Lattice say?
We present lattice results on the scalar meson and comment on the
state recently discovered by BaBar and confirmed by CLEO, in
view of a series of theoretical claims and counter claims. Lattice predictions
in the static limit indicate larger masses than observed for a scalar quark
model state. Finite quark mass corrections seem to further enlarge this
discrepancy, in support of a non quark-antiquark-state interpretation of
experiment.Comment: 4 pages, 1 Figur
"Glueballs": results and perspectives from the lattice
I review the present status of lattice calculations of properties of
gluon-rich hadrons and comment on future prospects, in view of planned
experiments.Comment: 4 pages, 1 Figure, Talk presented at Photon 2001, Ascona, CH, 2.9. -
7.9.0
Baryons on the lattice
I comment on progress of lattice QCD techniques and calculations. Recent
results on pentaquark masses as well as of the spectrum of excited baryons are
summarizned and interpreted. The present state of calculations of quantities
related to the nucleon structure and of electromagnetic transition form factors
is surveyed.Comment: 10 pages, Plenary talk at 10th International Conference on Structure
of Baryons (Baryons 2004), Palaiseau, France, 25-29 Oct 2004, 1 reference
added, minor improvement
QCD Phenomenology of Static Sources
We discuss the spectrum of open string and point particle excitations in QCD
with various source representations. Some general relations are introduced and
lattice results presented. In particular we discuss the short-distance
behaviour, relate this to perturbation theory expectations and comment on the
matching between low energy matrix elements and high energy Wilson
coefficients, within the framework of effective field theories.Comment: Invited Talk presented at LightCone 2004, 16-20 August 2004,
Amsterdam, 10 page
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