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Diffractive photoproduction of jets with the H1 detector |
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| Abstract |
Measurements are presented of single and double-differential dijet cross
sections in diffractive photoproduction ($Q2 < 0.01 GeV2$) based on 1999 and
2000 HERA data with an integrated luminosity of 54 $pb^{-1}$. The event
topology is given by $ep
ightarrow eXY$, 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 dijet cross sections are compared to
leading order Monte Carlo models and to 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
observed. The suppression of the data relative to the calculation is
investigated as a function of various kinematic variables. Ratios of the
diffractive to inclusive single-differential dijet cross sections are
measured for the first time. |
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