H1prelim-04-113

Comparison between diffractive dijet electroproduction and photoproduction

Reference Preliminary results expected for ICHEP2004, Summer 2004
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Contact S Schaetzel, F Eisele, F-P Schilling
Abstract A measurement is presented of diffractive dijet electroproduction using the same jet algorithm and kinematic region as a recent dijet measurement in diffractive photoproduction (H1prelim-02-113). Both measurements are compared to predictions based on diffractive parton densities extracted from inclusive diffractive scattering. Using the model prediction to relate the two measurements, the suppression of diffractive dijet-photoproduction relative to diffractive dijet-electroproduction is precisely evaluated. This suppression, its inverse often being referred to as a `gap survival probability' is expected to be present for direct photon scattering and absent for resolved photons.
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