Leptonic two-photon events measured with L3 at the Large Electron Positron Collider (LEP)

Virtual photons can fluctuate into diverse final states and among other processes, such fluctuations can yield muon-pairs. The fluctuation is a statistical process and can be described in terms of structure functions for photons. Apart from supplying another test of QED, purely leptonic processes provide a calibration fro the hadronic processes. We report on a measurement of dimuon events with single-tagged two-photon events from the LEP experiment L3, at c.m.s. energies between 189 GeV and 206 GeV, with an integrated luminosity of $\mathcal{L}$ = 600 pb$^{-1}$. An overview of the fundamental physical processes, the detector and the anaytical tools, used for measuring dimuon events, and a discussion of the structure of dimuon events will be presented.