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Diffractive dijet photoproduction in ep collisions at HERA

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 rapi...

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Main Authors: Aaron, Francisc Dionisie (Author) , Pirumov, Hayk (Author) , Sauter, Michel David (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author)
Corporate Author: H1 Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 05 October 2010
In: The European physical journal. C, Particles and fields
Year: 2010, Volume: 70, Pages: 15-37
ISSN:1434-6052
DOI:10.1140/epjc/s10052-010-1448-6
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-010-1448-6
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Author Notes:The H1 Collaboration*

MARC

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520 |a 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 xγof 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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