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.
| Type: | Article |
|---|---|
| Title: | The dependence of dijet production on photon virtuality in ep collisions at HERA |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjc/s2004-01885-2 |
| Publisher version: | http://dx.doi.org/10.1140/epjc/s2004-01885-2 |
| Language: | English |
| Additional information: | The ZEUS Collaboration includes the following UCL authors: J.M. Butterworth, R. Hall-Wilton, T.W. Jones, M.S. Lightwood, M.R. Sutton, C. Targett-Adams, and C. Gwenlan |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/9348 |
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