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Dijet cross sections and parton densities in diffractive DIS at HERA.

Aktas, A. and Alexa, C. and Henderson, Rob C. W. and Sloan, T. and H1 Collaboration, et al. (2007) Dijet cross sections and parton densities in diffractive DIS at HERA. Journal of High Energy Physics, 2007 (10). 042.

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Abstract

Differential dijet cross sections in diffractive deep-inelastic scattering are measured with the H1 detector at HERA using an integrated luminosity of 51.5 pb−1. The selected events are of the type ep → eXY, where the system X contains at least two jets and is well separated in rapidity from the low mass proton dissociation system Y. The dijet data are compared with QCD predictions at next-to-leading order based on diffractive parton distribution functions previously extracted from measurements of inclusive diffractive deep-inelastic scattering. The prediction describes the dijet data well at low and intermediate zIP (the fraction of the momentum of the diffractive exchange carried by the parton entering the hard interaction) where the gluon density is well determined from the inclusive diffractive data, supporting QCD factorisation. A new set of diffractive parton distribution functions is obtained through a simultaneous fit to the diffractive inclusive and dijet cross sections. This allows for a precise determination of both the diffractive quark and gluon distributions in the range 0.05 < zIP < 0.9. In particular, the precision on the gluon density at high momentum fractions is improved compared to previous extractions.

Item Type: Article
Journal or Publication Title: Journal of High Energy Physics
Uncontrolled Keywords: Lepton-Nucleon Scattering
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 18665
Deposited By: ep_ss_importer
Deposited On: 29 Oct 2008 13:09
Refereed?: Yes
Published?: Published
Last Modified: 10 Jun 2013 15:51
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/18665

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