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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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