Exclusive channels in $\gamma\gamma$ reactions: light at the end of the tunnel?
M.R. Pennington

TL;DR
This paper reviews the potential of studying exclusive channels in two-photon interactions to gain insights into fundamental physics, serving as an introduction to the Photon'99 session on exclusive reactions.
Contribution
It provides an overview of the physics insights obtainable from exclusive two-photon processes and introduces recent developments discussed at Photon'99.
Findings
Highlights the importance of exclusive channels in understanding photon interactions
Summarizes recent experimental and theoretical progress in the field
Emphasizes the potential for new physics discoveries through these channels
Abstract
The physics that can be learnt by studying exclusive channels in two photon interactions is recalled. This serves as an introduction to the Exclusive Reaction session of Photon'99.
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