CERN Accelerating science

Article
Report number	hep-ph/0509202
Title	Diffractive dijet production at HERA
Author(s)	Bruni, A ; Klasen, M ; Krämer, G ; Schatzel, S
Affiliation	(INFN Bologna, Italy) ; (Laboratoire de PHysique Subatomique et de Cosmologie, Université Joseph Fourier, Grenoble, France) ; (II. Inst. für Theoret. Physik, Universität Hamburg, Germany) ; (DESY FLC, Hamburg, Germany)
Publication	CERN, 2005
Imprint	20 Sep 2005
Number of pages	11
In:	HERA and the LHC : A Workshop on the Implications of HERA for LHC Physics, pp.519-529
DOI	10.5170/CERN-2005-014.519
Subject category	Particle Physics - Phenomenology
Abstract	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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