Photon Structure Function from L3 Data

With the reaction e(+)e(-) -> e(+)e(-)gamma*gamma -> e(+)e(-) hadrons, the L3 experiment at LEP has measured the hadronic photon structure function F-2(gamma) in a wide Q(2) and x range. The data are compared to other LEP experiments. Despite the high statistics and the small background contamination, the measurements are dominated by systematic uncertainties, mainly due poor agreement between the Monte Carlo models and the two-photon events.