Measurements of the QED Structure of the Photon

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dc.creatorThe OPAL Collaboration
dc.creatoral, G. Abbiendi et
dc.date1999-02-16
dc.date.accessioned2026-07-07T12:02:29Z
dc.date.available2026-07-07T12:02:29Z
dc.descriptionThe structure of both quasi-real and highly virtual photons is investigated using the reaction e+e- -> e+e-mu+mu-, proceeding via the exchange of two photons. The results are based on the complete OPAL dataset taken at e+e- centre-of-mass energies close to the mass of the Z boson. The QED structure function F_2^gamma and the differential cross-section dsigdx for quasi-real photons are obtained as functions of the fractional momentum x from the muon momentum which is carried by the struck muon in the quasi-real photon for values of Q**2 ranging from 1.5 to 400 GeV**2. The differential cross-section dsigdx for highly virtual photons is measured for 1.5< Q**2 < 30 GeV**2 and 1.5< P**2 < 20 GeV**2, where Q**2 and P**2 are the negative values of the four-momentum squared of the two photons such that Q**2 > P**2. Based on azimuthal correlations the QED structure functions F_A^gamma and F_B^gamma for quasi-real photons are determined for an average Q**2 of 5.4 GeV**2.
dc.description39 pages, LaTeX, 14 eps figs included, submitted to European Physical Journal C
dc.identifierhttps://arxiv.org/abs/hep-ex/9902024
dc.identifierhttp://arxiv.org/abs/hep-ex/9902024
dc.identifierEur.Phys.J.C11:409-425,1999
dc.identifierdoi:10.1007/s100520050644
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207459
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurements of the QED Structure of the Photon
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