Two-photon physics Page: 2 of 30
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I. INTRODUCTION
A new experimental frontier has recently been opened to
the study of two photon processes. The first results of
many aspects of these reactions are being presented at this
conference. In contrast, the theoretical development of
research into two photon processes has a much longer
history. In this talk, I will review the many different
theoretical ideas which provide a detailed framework for our
understanding of two photon processes.
This field began with papers by Low' on resonance
production and by Calagero and Zemach2 on meson pair
production, both published in the same volume of the
Physical Review in 1960. After a dormant period, interest
in two photon processes was renewed in 1970 by a number of
groups'''. The classic papers by Brodsky, Kinoshita, and
Terazawa3 emphasize the intrinsic physical interest of two
photon processes in addition to their role as a background
to the annihilation reactions in e e collisions. The
advent of these papers was followed by a burst of
theoretical activity which is largely summarized in reviews
by Terazawa6 and Budnev et a17. After a diversion provided
by the discovery of charm, interest in two photon processes
was renewed with emphasis on structure functions, jets and
QCD. The progress of the field, both theoretically and
experimentally, is emphasized by the creation of specialized
annual workshops held at Lake Tahoe in 1979, Amiens in 1980,
and in Paris in 1981. *We can look forward to continuing
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Bardeen, W.A. Two-photon physics, article, October 1, 1981; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1055419/m1/2/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.