Diffractive Jet Production in Deep-Inelastic e^+p Collisions at HERA

Details Diffractive Jet Production in Deep-Inelastic e^+p Collisions at HERA Diffractive Jet Production in Deep-Inelastic e^+p Collisions at HERA

2000-12-21

arxiv.org/abs/hep-ex/0012051v1

Eur.Phys.J.C20:29-49,2001

Physics

High Energy Physics

High Energy Physics - Experiment

35 pages, 12 figures, 7 tables

Scientific paper

10.1007/s100520100634

A measurement is presented of dijet and 3-jet cross sections in low-|t| diffractive deep-inelastic scattering interactions of the type ep -> eXY, where the system X is separated by a large rapidity gap from a low-mass baryonic system Y. Data taken with the H1 detector at HERA, corresponding to an integrated luminosity of 18.0 pb^(-1), are used to measure hadron level single and double differential cross sections for 44 GeV. The energy flow not attributed to jets is also investigated. The measurements are consistent with a factorising diffractive exchange with trajectory intercept close to 1.2 and tightly constrain the dominating diffractive gluon distribution. Viewed in terms of the diffractive scattering of partonic fluctuations of the photon, the data require the dominance of qqbarg over qqbar states. Soft colour neutralisation models in their present form cannot simultaneously reproduce the shapes and the normalisations of the differential cross sections. Models based on 2-gluon exchange are able to reproduce the shapes of the cross sections at low x_pom values.

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