Eur. Phys. J. C 10, 443-460
DOI 10.1007/s100529900129
Probing the structure of the pomeron
J. Ellis1 - G.G. Ross2 - J. Williams2
1 Theoretical Physics Division, CERN, CH-1211 Geneva 23,
Switzerland (e-mail: john.ellis@cern.ch)
2 Department of Physics, Theoretical Physics,
1 Keble Road, Oxford OX1 3NP, UK
(e-mail: ross@thphys.ox.ac.uk;
j.williams1@physics.ox.ac.uk)
Received: 5 March 1999 / Published online: 3 August 1999
Abstract
We suggest that the pseudo-rapidity cut dependence of diffractive
deep-inelastic scattering events at HERA may provide a sensitive test of
models of diffraction. A comparison with the experimental cross
section shows that the Donnachie-Landshoff model and a simple two-gluon
exchange model of the pomeron model are disfavoured. However a
model with a direct coupling of the pomeron to quarks is viable for a
harder quark-pomeron form factor, as is a model based on the
leading-twist operator contribution. We also consider a direct-coupling
scalar pomeron model. We comment on the implications of
these results for the
determination of the partonic structure of the pomeron.
Copyright Springer-Verlag
