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Abstract: Measurements are presented of single and double-differential dijet crosssections in diffractive photoproduction based on a data sample with anintegrated luminosity of 47 pb^-1. The events are of the type ep -> eXY, wherethe hadronic system X contains at least two jets and is separated by a largerapidity gap from the system Y, which consists of a leading proton or low-massproton excitation. The dijet cross sections are compared with QCD calculationsat next-to-leading order and with a Monte Carlo model based on leading ordermatrix elements with parton showers. The measured cross sections are smallerthan those obtained from the next-to-leading order calculations by a factor ofabout 0.6. This suppression factor has no significant dependence on thefraction x gamma of the photon four-momentum entering the hard subprocess.Ratios of the diffractive to the inclusive dijet cross sections are measuredfor the first time and are compared with Monte Carlo models.



Author: H1 Collaboration

Source: https://arxiv.org/







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