5 research outputs found
The Landshoff-Nachtmann Pomeron on the Lattice
We investigate the Landshoff-Nachtmann two-gluon-exchange model of the
Pomeron using gluon propagators computed in the Landau gauge within quenched
lattice QCD calculations. We first determine an effective gluon-quark coupling
by constraining the Pomeron-quark coupling to its phenomenological value
\beta_0 = 2\, \gev^{-1}. We then provide predictions for a variety of
diffractive processes. As the propagators have been evaluated entirely from QCD
first principles (although in the quenched approximation), our results provide
a consistency check of the Landshoff-Nachtmann model. We address the issue of
the possible gauge-dependence of our results, which will be the object of a
future study.Comment: uuencoded, compressed tar file, 13 pages latex, 4 Postscript figures,
requires epsf.st
Channel-Coupling Effects in High-Energy Hadron Collisions
The Two-Gluon Model of the Pomeron predicts strongly size-dependent
high-energy hadron cross sections. Yet experimental cross sections for radially
excited mesons appear surprisingly close in value. The strong coupling of these
mesons in hadron collisions also predicted by the model permits a qualitative
understanding of this puzzling behavior in terms of eigenmode propagation with
a common eigen-. A detailed semiempirical coupled-channel model of the
Pomeron is constructed to elucidate this and other features of high-energy
hadron cross sections.Comment: 13 pages, latex, no figure