Journal article
The dependence of dijet production on photon virtuality in ep collisions at HERA
The European physical journal. C, Particles and fields, Vol.35(4), pp.487-500
07/01/2004
DOI: 10.1140/epjc/s2004-01885-2
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) < 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) > 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 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.
Details
- Title: Subtitle
- The dependence of dijet production on photon virtuality in ep collisions at HERA
- Creators
- ZEUS CollaborationJ Repond (Contributor)
- Resource Type
- Journal article
- Publication Details
- The European physical journal. C, Particles and fields, Vol.35(4), pp.487-500
- DOI
- 10.1140/epjc/s2004-01885-2
- ISSN
- 1434-6044
- eISSN
- 1434-6052
- Publisher
- Springer Nature
- Number of pages
- 14
- Language
- English
- Date published
- 07/01/2004
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627192102771
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