Lehto, Mark H.; (1994) A measurement of the photon structure function F2(x). Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

Measurements of the hadronic photon structure function F2(x) are presented in two Q2 ranges (mean values 5.9 GeV2 and 14.7 GeV2). The results confirm that there is a significant pointlike component of the photon when the probe photon has Q2 > 4 GeV2. The measurements extend to lower values of x than any previous experiment, and no increase of F2(x) is observed in this region. In the context of a perturbative QCD + vector meson dominance (VMD) model the quark transverse momentum cutoff separating the VMD and perturbative QCD regions is found to be 0.44 ± 0.12 GeV. The data prefers a VMD component which has only peripheral scattering of the quarks in the γγ centre of mass. The data were taken by the OPAL experiment at LEP, with √s close to the Z0 mass and correspond to an integrated e+e- luminosity of 18.43 pb-1. The analysis is based on 596 events which pass the final selection cuts.

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