Diffractive dijet production at HERA

Details Diffractive dijet production at HERA Diffractive dijet production at HERA

2005-09-20

arxiv.org/abs/hep-ph/0509202v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 9 figures, HERA-LHC workshop

Scientific paper

We present recent experimental data from the H1 and ZEUS Collaborations at HERA for diffractive dijet production in deep-inelastic scattering (DIS) and photoproduction and compare them with next-to-leading order (NLO) QCD predictions using diffractive parton densities. While good agreement is found for DIS, the dijet photoproduction data are overestimated by the NLO theory, showing that factorization breaking occurs at this order. While this is expected theoretically for resolved photoproduction, the fact that the data are better described by a global suppression of direct and resolved contribution by about a factor of two comes as a surprise. We therefore discuss in some detail the factorization scheme and scale dependence between direct and resolved contributions and propose a new factorization scheme for diffractive dijet photoproduction.

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