Journal article
The Q2 dependence of dijet cross sections in γp interactions at HERA
Physics letters. B, Vol.479(1), pp.37-52
04/2000
DOI: 10.1016/S0370-2693(00)00311-7
Abstract
The dependence of the photon structure on the photon virtuality, Q2, is studied by measuring the reaction e+p → e+ + jet + jet + X at photon-proton centre-of-mass energies 134 < W < 223 GeV. Events have been selected in the Q2 ranges ≃ 0 GeV2, 0.1-0.55 GeV2, and 1.5-4.5 GeV2, having two jets with transverse energy E(T)/(jet) > 5.5 GeV in the final state. The dijet cross section has been measured as a function of the fractional momentum of the photon participating in the hard process, x(γ)/(OBS). The ratio of the dijet cross section with x(γ)/(OBS) < 0.75 to that with x(γ)/(OBS) > 0.75 decreases as Q2 increases. The data are compared with the predictions of NLO pQCD and leading-order Monte Carlo programs using various parton distribution functions of the photon. The measurements can be interpreted in terms of a resolved photon component that falls with Q2 but remains present at values of Q2 up to 4.5 GeV2. However, none of the models considered gives a good description of the data.
Details
- Title: Subtitle
- The Q2 dependence of dijet cross sections in γp interactions at HERA
- Creators
- ZEUS CollaborationJ. Repond (Contributor)U. Mallik (Contributor) - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Physics letters. B, Vol.479(1), pp.37-52
- DOI
- 10.1016/S0370-2693(00)00311-7
- ISSN
- 0370-2693
- eISSN
- 1873-2445
- Publisher
- Elsevier B.V
- Language
- English
- Date published
- 04/2000
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627330702771
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