Abstract
A measurement is presented of single- and double-differential dijet crosssections in diffractive deep-inelastic $ep$ scattering at HERA using datacollected by the H1 experiment corresponding to an integrated luminosity of 290pb^{-1}. The investigated phase space is spanned by the photon virtuality inthe range of 4<Q^{2}<100 GeV^{2} and by the fractional proton longitudinalmomentum loss x_pom<0.03. The resulting cross sections are compared withnext-to-leading order QCD predictions based on diffractive parton distributionfunctions and the value of the strong coupling constant is extracted.
Highlights
The measured cross sections are compared to next-to-leading order (NLO) QCD predictions evaluated with input DPDFs determined in previous inclusive diffractive measurements by the H1 collaboration [4]
The uncertainty on the NLO prediction is found to be significantly larger than the experimental uncertainty
The double differential cross section measured in bins of p∗T,1 and Q2 is shown in figure 9 and the corresponding ratios of the measurements to the NLO predictions are shown in figure 10
Summary
A leading order (LO) diagram of boson-gluon fusion, which is the dominant process for the production of two jets in diffractive DIS, is depicted in figure 1. The incoming electron of four-momentum k interacts with the incoming proton of four-momentum p via the exchange of a virtual photon of four-momentum q = k − k′. The outgoing proton or its low-mass dissociation state carries four-momentum p′. The DIS kinematics is described by the following set of variables: Q2 = −q2 = (k − k′), x. Where Q2, x and y denote the photon virtuality, the Bjorken-x variable and the inelasticity of the process, respectively. With xIP and t being the longitudinal momentum fraction of the incoming proton carried by the pomeron and the squared four-momentum transfer at the proton vertex, respectively. The fractional longitudinal momentum of the pomeron transferred to the dijet system is given by zIP q q·v · (p − p′). Where v is the four-momentum of the parton entering the hard interaction
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