Analysis of Rapidity Gap Cuts in Diffractive DIS

The requirement of a large pseudo-rapidity gap to select diffractive DIS events at HERA restricts the kinematically accessible region of phase space for a significant range of $Q^2$, $\beta$ and \xpom. Consequences of this include a breakdown of \xpom-factorization in large rapidity gap diffractive samples and an enhancement in the relative contribution of quark-antiquark-gluon processes over dijet processes in the diffractive DIS sample.Comment: LaTeX, 3 pages, 2 figures in PS files, uses npb.sty. Contribution to the Proceedings of the 7th International Workshop on Deep Inelastic Scattering and QCD, DIS99, DESY-Zeuthen, April 1999; Nucl. Phys. B (Proc. Suppl.

Issues on NLO pQCD Programs

This paper summarizes a talk presented at the Durham HERA '98 Workshop. We compare the features that are available in NLO pQCD programs and demonstrate that understanding where in phase space NLO calculations are accurate is vital for extracting information from measurements at the HERA experiments.Comment: 3 page

Jet production at HERA I

This article reviews recent jet physics results from HERA