Abstract
The electromagnetic and weak structure functions of the photon can be studied in the deep inelastic electron-photon processes eγ→ e+ X and eγ→ ν+ X. While at low energies only virtual photon exchange is operative in the neutral-current process, additional Z-exchange becomes relevant for high Q 2 of order M Z 2 at e + e − linear colliders. Likewise the charged-current process can be observed at these high energy colliders. By measuring the electroweak neutral- and charged-current structure functions, the up- and down-type quark content of the photon can be determined separately.
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