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Dijet cross sections and parton densities in diffractive DIS at HERA

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journal contribution
posted on 2007-10-01, 00:00 authored by A Aktas, C Alexa, V Andreev, T Anthonis, B Antunovic, S Aplin, A Asmone, A Astvatsatourov, S Backovic, A Baghdasaryan, P Baranov, E Barrelet, W Bartel, S Baudrand, M Beckingham, K Begzsuren, N Berger, Gang LiGang Li, H1 Collaboration
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 zℙ (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 < zℙ < 0.9. In particular, the precision on the gluon density at high momentum fractions is improved compared to previous extractions. © SISSA 2007.

History

Journal

Journal of high energy physics

Volume

2007

Location

Bologna, Italy

Open access

  • Yes

ISSN

1126-6708

eISSN

1029-8479

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2007, SISSA

Issue

10

Publisher

IOP Press

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