H1prelim-08-012

Diffractive photoproduction of jets with the H1 detector

Reference Preliminary for DIS2008, Spring 2008
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Contact K. Cerny, A. Valkarova, P. Newman
Abstract Two measurements are presented of differential dijet cross sections in diffractive photoproduction (Q2 < 0.01 GeV2) based on 1999 and 2000 HERA data with integrated luminosity of 54 pb^-1. The event topology is given by ep -> eXY, where the system X, containing at least two jets, is separated from a leading low-mass proton dissociative system Y by a large rapidity gap. The measurements are made in two kinematic ranges differing primarily in the transverse energy requirements on the two hardest jets. The dijet cross sections are compared with next-to-leading order QCD predictions based on recent diffractive parton densities obtained by H1. The next-to-leading order calculations predict larger cross sections than the data. The suppression of the date relative to the calculation is found to have no significant dependence on the photon four-momentum fraction entering the hard subprocess. There is a suggestion of a dependence of the suppression factor on the transverse energy of the jets.
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