ZEUS Collaboration, The; (2004) The dependence of dijet production on photon virtuality in ep collisions at HERA. The European Physical Journal C , 35 (4) pp. 487-500. 10.1140/epjc/s2004-01885-2.

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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 less than or similar to Q(2) lt 2000 GeV2 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) gt 7.5 and 6.5 GeV and pseudorapidities in the photon-proton centre-of-mass frame in the range -3 lt eta(jet) lt 0. The variable x(gamma)(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-x(gamma)(obs) events was measured. Next-to-leading-order QCD predictions were found to generally underestimate the low- x(gamma)(obs) contribution relative to that at high x(gamma)(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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