| Abstract | The production of dijets in diffractive deep inelastic scattering,
ep -> e gamma* p -> e p jet1 jet2 X, has been measured with the H1
detector at HERA using Very Forward Proton Spectrometer to measure the
scattered proton momentum. The data correspond to an integrated luminosity
of 95 pb^-1. This process is sensitive to the partonic structure of the
diffractive exchange between the proton and the virtual photon. The
scattered proton is measured using the VFPS with an acceptance of about
90% in the range 0.009 < x_pom < 0.025, where x_pom is the energy fraction
lost by the proton in the interaction. The dijet cross section has been
measured for virtualities of the exchanged boson, 5 < Q^2 < 80 GeV^2 and
photon-proton centre-of-mass energies, 100 < W < 250 GeV and |t| < 1 GeV^2.
The jets were identified using the inclusive k_T algorithm in the
gamma* p frame. The two highest transverse energy jets identified in
each event were required to satisfy E*_{T, jet} > 5.5 and 4 GeV,
respectively in the pseudorapidity range -2.0 < eta_{jet} < 2. The cross
sections are compared to the predictions from leading-logarithm
parton-shower RapGap Monte Carlo and next-to-leading-order QCD
calculations based on recent diffractive parton densities extracted from
inclusive diffractive deep inelastic scattering data. |
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