Abstract

The cross section of the diffractive process e + p → e + Xp is measured at a centre-of-mass energy of 318 GeV, where the system X contains at least two jets and the leading final state proton p is detected in the H1 Very Forward Proton Spectrometer. The measurement is performed in photoproduction with photon virtualities Q 2 < 2 GeV2 and in deep-inelastic scattering with 4 GeV2 < Q 2 < 80 GeV2. The results are compared to next- to-leading order QCD calculations based on diffractive parton distribution functions as extracted from measurements of inclusive cross sections in diffractive deep-inelastic scattering.

Highlights

  • The integrated e+ p diffractive dijet cross sections in the γp and in the DIS regime measured in the kinematic range defined in table 1 are presented together with next-to-leading order (NLO) QCD and RAPGAP predictions in table 2

  • For the leading proton detection, the H1 Very Forward Proton Spectrometer is used for the first time, such that the diffractive sample is free of background from low-mass proton dissociative states

  • In DIS, diffractive dijet production is well described within the experimental and theoretical uncertainties by the NLO calculations based on the H12006 Fit-B diffractive parton densities of the proton

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Summary

Introduction

The integrated e+ p diffractive dijet cross sections in the γp and in the DIS regime measured in the kinematic range defined in table 1 are presented together with NLO QCD and RAPGAP predictions in table 2. The integrated diffractive dijet cross section in photoproduction is overestimated by the NLO QCD theory by almost a factor of two, with considerable theory uncertainty. The integrated NLO QCD cross section predictions are in disagreement with three independent H1 measurements of diffractive dijet photoproduction.

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