Measurement of dijet production in diffractive deep inelastic scattering at HERA

The dijet production in diffractive deep inelastic scattering, ep → e′p jet1 jet2 X′, has been measured with the ZEUS detector at HERA using an integrated luminosity of 65.2 pb^-1. This process is sensitive to the partonic structure of the diffractive exchange between the proton and the virtual photon emitted from the electron. The dijet cross section for such processes has been measured for virtualities of the exchanged boson, 5 < Q² < 100 GeV² and photon-proton centre-of-mass energies, 100 T algorithm in the γ^*-p frame. The two highest transverse energy jets identified in each event were required to satisfy E_T,_jets^* > 5 and 4 GeV, respectively in the pseudorapidity range -3.5 < η_jets^* < 0, as measured in the γ^*-p frame. The differential cross sections have been measured and compared to the predictions from leading order Monte Carlo models and next-to-leading order QCD calculations based on recent diffractive parton densities extracted from inclusive diffractive deep inelastic scattering data. (author)