Two-Photon Processes and Photon Structure

Abstract

In this article aspects of photon-photon physics related to the structure of real and virtual photons are reviewed. A re-calculation of the virtual photon-photon box is performed and some discrepancies in the literature are clarified. A useful compilation of various relevant limits derived from the most general expressions is provided. Furthermore, structure functions of spin-averaged, transverse and longitudinal virtual target photons are defined and discussed. Finally, the factorization of two-photon processes in the Bjorken limit is demonstrated to hold also for the case of virtual target photons.

LaTeX, 38 pages

References in corpus (7)

• Spin-Dependent Structure Functions of Real and Virtual Photons
• Spin-Dependent Structure Functions of the Photon
• Double-Tag Events in Two-Photon Collisions at LEP
• QCD radiative corrections to ${\gamma }^{\ast }{\gamma }^{\ast }\to$ hadrons
• Positivity constraints on photon structure functions
• Structure of Virtual Photons at HERA
• High-Energy Asymptotics of Photon--Photon Collisions in QCD

Cited by in corpus (1)

• Squark Contributions to Photon Structure Functions and Positivity Constraints