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      The dependence of dijet production on photon virtuality in ep collisions at HERA

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          Abstract

          The dependence of dijet production on the virtuality of the exchanged photon, Q^2, has been studied by measuring dijet cross sections in the range 0 < Q^2 < 2000 GeV^2 with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb^-1. Dijet cross sections were measured for jets with transverse energy E_T^jet > 7.5 and 6.5 GeV and pseudorapidities in the photon-proton centre-of-mass frame in the range -3 < eta^jet <0. The variable xg^obs, a measure of the photon momentum entering the hard process, was used to enhance the sensitivity of the measurement to the photon structure. The Q^2 dependence of the ratio of low- to high-xg^obs events was measured. Next-to-leading-order QCD predictions were found to generally underestimate the low-xg^obs contribution relative to that at high xg^obs. Monte Carlo models based on leading-logarithmic parton-showers, using a partonic structure for the photon which falls smoothly with increasing Q^2, provide a qualitative description of the data.

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          Successive Combination Jet Algorithm For Hadron Collisions

          , (2010)
          Jet finding algorithms, as they are used in \(e^+ e^-\) and hadron collisions, are reviewed and compared. It is suggested that a successive combination style algorithm, similar to that used in \(e^+ e^-\) physics, might be useful also in hadron collisions, where cone style algorithms have been used previously.
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            Parton Distributions of the Proton

            , , (2010)
            To obtain improved parton densities of the proton, we present a new global analysis of deep inelastic and related data including, in particular, the recent measurements of \(F_2\) at HERA, of the asymmetry of the rapidity distributions of \(W^\pm\) production at the FNAL \(pp\) collider and of the asymmetry in Drell-Yan production in \(pp\) and \(pn\) collisions. We also incorporate data to determine the flavour dependence of the quark sea distributions. We find that the behaviour of the partons at small \(x\) is consistent with the precocious onset of BFKL leading \(\log(1/x)\) dynamics. We discuss the ambiguities remaining in the gluon distribution. We present improved predictions for \(W\) boson (and \(t\) quark) production at the FNAL \(\pp\) collider.
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              High-Energy Inelastice−pScattering at 6° and 10°

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                Author and article information

                Journal
                26 April 2004
                2004-05-25
                Article
                10.1140/epjc/s2004-01885-2
                hep-ex/0404033
                9157e108-e83a-43ad-8c4f-97f506c531d7
                History
                Custom metadata
                Eur.Phys.J.C35:487-500,2004
                35 pages, 6 eps figures, submitted to Eur.Phys.J.C
                hep-ex

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