Ward, John Jason; (1996) A study of photon structure with special attention to the low-x region. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

Singly-tagged two-photon collisions are studied in the OPAL detector at LEP using 45.9 pb-1 of data taken during the years 1990–1992 at and near a beam energy of 45.6 GeV. The energy and angle of the scattered electron or positron are measured by the OPAL Forward Detector, resulting in a Q2 range of 4–30 GeV2. The data distributions are compared with Monte Carlo distributions from F2GEN and HERWIG. Distributions of energy flow relative to the tag demonstrate that F2GEN and HERWIG do not model the hadronic final state well. Unfolded results for the photon structure function F2y(x) on a log10x scale are presented for two Q2 ranges, with mean values of 6.4 GeV2 and 15.1 GeV2. The measurement of F2y(x) is shown to be dominated by systematic errors in the low-x region.

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