Inclusive Diffraction at HERA

Details Inclusive Diffraction at HERA Inclusive Diffraction at HERA

2008-09-21

arxiv.org/abs/0809.3605v2

Physics

High Energy Physics

High Energy Physics - Experiment

Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 4 pages, LaTeX, 10 eps figures

Scientific paper

The H1 and Zeus collaborations have measured the inclusive diffractive DIS cross section ep -> eXp and these measurements are in good agreement within a normalisation uncertainty. Diffractive parton density functions (DPDFs) have been extracted from NLO QCD fits to inclusive measurements of diffractive DIS and the predictions of these DPDFs are compared with measurements of diffractive dijets in DIS, testing the validity of the factorisation approximations used in their extraction. H1 then use these diffractive dijets in DIS data to provide further constraints in a combined QCD fit, resulting in the next generation of DPDFs which have constrained the diffractive gluon at large momentum fractions. Finally, the predictions of DPDFs are compared to diffractive dijets in photoproduction where the issue of survival probability in a hadron-hadron environment can be studied.

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