1,174,270 research outputs found
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 , 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.
Measurement of Feynman-x Spectra of Photons and Neutrons in the Very Forward Direction in Deep-Inelastic Scattering at HERA
Measurements of normalised cross sections for the production of photons and
neutrons at very small angles with respect to the proton beam direction in
deep-inelastic scattering at HERA are presented as a function of the
Feynman variable and of the centre-of-mass energy of the virtual
photon-proton system . The data are taken with the H1 detector in the years
2006 and 2007 and correspond to an integrated luminosity of . The measurement is restricted to photons and neutrons in the
pseudorapidity range and covers the range of negative four momentum
transfer squared at the positron vertex GeV, of inelasticity
and of GeV. To test the Feynman scaling hypothesis the
dependence of the dependent cross sections is investigated.
Predictions of deep-inelastic scattering models and of models for hadronic
interactions of high energy cosmic rays are compared to the measured cross
sections.Comment: 30 pages, 5 tables, 10 figures, submitted to EPJ
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
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