Measurement of the hadronic photon structure function F2γ at LEP2

G Abbiendi; C Ainsley; PF Åkesson; G Alexander; J Allison; G Anagnostou; KJ Anderson; S Asai; D Axen; G Azuelos; I Bailey; E Barberio; RJ Barlow; RJ Batley; P Bechtle; T Behnke; KW Bell; PJ Bell; G Bella; A Bellerive; G Benelli; S Bethke; O Biebel; IJ Bloodworth; O Boeriu; P Bock; D Bonacorsi; M Boutemeur; S Braibant; L Brigliadori; RM Brown; K Buesser; HJ Burckhart; J Cammin; S Campana; RK Carnegie; B Caron; AA Carter; JR Carter; CY Chang; DG Charlton; I Cohen; A Csilling; M Cuffiani; S Dado; GM Dallavalle; S Dallison; A De Roeck; EA De Wolf; K Desch; M Donkers; J Dubbert; E Duchovni; G Duckeck; IP Duerdoth; E Etzion; F Fabbri; L Feld; P Ferrari; F Fiedler; I Fleck; M Ford; A Frey; A Fürtjes; P Gagnon; JW Gary; G Gaycken; C Geich-Gimbel; G Giacomelli; P Giacomelli; M Giunta; J Goldberg; E Gross; J Grunhaus; M Gruwé; PO Günther; A Gupta; C Hajdu; M Hamann; GG Hanson; K Harder; A Harel; M Harin-Dirac; M Hauschild; J Hauschildt; CM Hawkes; R Hawkings; RJ Hemingway; C Hensel; G Herten; RD Heuer; JC Hill; K Hoffman; RJ Homer; D Horváth; R Howard; P Hüntemeyer; P Igo-Kemenes; K Ishii; H Jeremie

Journal article

Measurement of the hadronic photon structure function F2γ at LEP2

G Abbiendi, C Ainsley, PF Åkesson, G Alexander, J Allison, G Anagnostou, KJ Anderson, S Asai, D Axen, G Azuelos, I Bailey, E Barberio, RJ Barlow, RJ Batley, P Bechtle, T Behnke, KW Bell, PJ Bell, G Bella, A Bellerive Show all

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics | Published : 2002

DOI: 10.1016/S0370-2693(02)01560-5

Abstract

The hadronic structure function of the photon F2 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 F2 γ are extended to an average Q2 of (Q2) = 780 GeV2 using data in the kinematic range 0.15 < × < 0.98. The Q2 evolution of F2 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 F2 γ with F2 γ (Q2)/α = (0.08 ± 0.02-0.03 +0.05)+(0.13 ± 0.01 -0.01 +0.01) 1n Q2, where Q2 is in GeV2, for the central x region 0.10-0.60..

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