2021 Impact factor 4.991
Particles and Fields

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

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.

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