Title
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Diffractive dijet photoproduction in **ep** collisions at HERA
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Author
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Institution/Organisation
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H1 Collaboration
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Abstract
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Measurements are presented of single and double-differential dijet cross sections in diffractive photoproduction based on a data sample with an integrated luminosity of 47 pb−1. The events are of the type ep→eXY, where the hadronic system X contains at least two jets and is separated by a large rapidity gap from the system Y, which consists of a leading proton or low-mass proton excitation. The dijet cross sections are compared with QCD calculations at next-to-leading order and with a Monte Carlo model based on leading order matrix elements with parton showers. The measured cross sections are smaller than those obtained from the next-to-leading order calculations by a factor of about 0.6. This suppression factor has no significant dependence on the fraction x γ of the photon four-momentum entering the hard subprocess. Ratios of the diffractive to the inclusive dijet cross sections are measured for the first time and are compared with Monte Carlo models. |
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Language
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English
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Source (journal)
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European physical journal : C : particles and fields. - Berlin
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Publication
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Berlin
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2010
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ISSN
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1434-6044
1434-6052
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DOI
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10.1140/EPJC/S10052-010-1448-6
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Volume/pages
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70
:1/2
(2010)
, p. 15-37
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ISI
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000284423800003
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Full text (Publisher's DOI)
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Full text (open access)
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