Abstracts of short contributions presented in parallel sessions (theory)
A comparison is made between various equivalent-photon formulas. It is explained, and shown numerically, why the Dalitz-Yennie (or Brodsky Kinoshita-Terazawa) version of the equivalent-photon approximation becomes unappropriate for photon-photon collision processes when the scattered electrons are tagged at finite angles.
KeywordsTransverse Momentum Invariant Mass Central Detector Photon Structure Function Resonance Production Cross
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