Abstract
Dijet production in diffractive deep inelastic scattering (DIS) and photoproduction has been measured with both H1 and ZEUS detectors at HERA. The cross section for diffractive dijets in DIS is sensitive to the gluon contribution in the diffractive reaction. The results are compared to next-toleading order (NLO) QCD predictions using various diffractive parton density functions (DPDFs) obtained from the measurements of F D 2 . In the case of photoproduction, the cross sections are well described in shape by the NLO prediction using a DPDF which describes the cross section in DIS. But, the magnitude is about half of the measured cross sections. The results indicate a global suppression in diffractive photoproduction, although the uncertainty in the DPDFs needs to be evaluated before firmer conclusions can be made.
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