Measurement of dijet production in diffractive deep-inelastic scattering with a leading proton at HERA

Abstract

The cross section of diffractive deep-inelastic scattering ep - GT eXp is measured, where the system X contains at least two jets and the leading final state proton is detected in the H1 Forward Proton Spectrometer. The measurement is performed for fractional proton longitudinal momentum loss x(P) LT 0.1 and covers the range 0.1 LT vertical bar t vertical bar LT 0.7 GeV2 in squared four-momentum transfer at the proton vertex and 4 LT Q(2) LT 110 GeV2 in photon virtuality. The differential cross sections extrapolated to vertical bar t vertical bar LT 1 GeV2 are in agreement with next-to-leading order QCD predictions based on diffractive parton distribution functions extracted from measurements of inclusive and dijet cross sections in diffractive deep-inelastic scattering. The data are also compared with leading order Monte Carlo models.