Measurement of the photon structure function at high $Q^{2}$ at LEP

The structure functions of real and virtual photons are derived from cross section measurements of the reaction e + e − →e + e − + hadrons at LEP. The reaction is studied at s ≃91 GeV with the L3 detector. One of the final state electrons is detected at a large angle relative to the beam direction, leading to Q 2 values between 40 GeV 2 and 500 GeV 2 . The other final state electron is either undetected or it is detected at a four-momentum transfer squared P 2 between 1 GeV 2 and 8 GeV 2 . These measurements are compared with predictions of the Quark Parton Model and other QCD based models.

electron positron: colliding beams
exchange: two-photon
hadron: photoproduction
momentum transfer: high
photon: structure function
x-dependence
event shape analysis
quark model parton
L3
experimental results

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Measurement of the photon structure function at high Q2Q^{2}Q2 at LEP

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Measurement of the photon structure function at high $Q^{2}$ at LEP