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Measurement of the hadronic photon structure function F_{2}^{γ} at LEP2

Abbiendi, G; Ainsley, C; Åkesson, PF; Alexander, G; Allison, J; Anagnostou, G; Anderson, KJ; ... Hawkings, R; + view all (2002) Measurement of the hadronic photon structure function F_{2}^{γ} at LEP2. Physics Letters B , 533 (3-4) pp. 207-222. 10.1016/S0370-2693(02)01560-5. Green open access

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Abstract

The hadronic structure function of the photon F_{2}^{γ} (x, Q²) is measured as a function of Bjorken x and of the photon virtuality Q² using deep-inelastic scattering data taken by the OPAL detector at LEP at e⁺e⁻ centre-of-mass energies from 183 to 209 GeV. Previous OPAL measurements of the x dependence of F_{2}^{γ} are extended to an average Q² of 〈Q²〉=780 GeV² using data in the kinematic range 0.15<x<0.98. The Q² evolution of F_{2}^{γ} is studied for 12.1<〈Q²〉<780 GeV² using three ranges of x. As predicted by QCD, the data show positive scaling violations in F_{2}^{γ} with F_{2}^{γ} (Q²)/α = (0.08±0.02⁺⁰·⁰⁵_₀.₀₃) + (0.13±0.01⁺⁰·⁰¹_₀.₀₁) lnQ², where Q² is in GeV², for the central x region 0.10–0.60. Several parameterisations of F_{2}^{γ} are in qualitative agreement with the measurements whereas the quark-parton model prediction fails to describe the data.

Type: Article
Title: Measurement of the hadronic photon structure function F_{2}^{γ} at LEP2
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/S0370-2693(02)01560-5
Publisher version: https://doi.org/10.1016/S0370-2693(02)01560-5
Language: English
Additional information: © 2002 Elsevier Science B.V. Open access under CC BY license (https://creativecommons.org/licenses/by/3.0/).
Keywords: function, measurement, Photon, Structure
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
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/9838
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