Developments in the phenomenology of two-to-three particle reactions Page: 2 of 50
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I. IN RXUUCTION
Reactions in which two hadrons enter and three emerge are the simplest
inelastic processes. The recent history of the phenaenology of 2 to 3 particle
hadronic reactions dates to 1967, when papers wre published by Chan and
collaborators1 at CERN, by Chew and collaborators1 in Berkeley, and by
Zachariasen and Zweig.1 Their comonn approach was an extension of peripheral
ideas, which had been useful in 2 - 2 reactions, to 2 + 3 processes.
Amplitudes for 2 - 3 reactions were based on doubly peripheral graphs, such
as sketched in Fig. 1(b), and were meant to be valid only when subenergies
are suitably large. In this sari-r domain of applicability, practical results
were severely limited by lack of data. Most events are concentrated in the
part of phase space where at least me subenergy is small.
The next development of importance was the advent of explicit dual models.
The five-po-rit function, B5, turned the low subenergy difficulty into an
advantage and fits to data provided some valuable lessons.2 However, the
model -as soon recognized to be overly rigid, and it passed quietly into
For most of the past four years, the study of the simplest inelastic
processes, 2 - 3, has enjoyed benign neglect by most phenomenologists. Our
experimental colleagues have not rested, however. Bubble chamber statistics
are now an order of magnitude better than they used to be. Several counter
spectrometers have been built, at CERN, Argonne, SIAC. BNL, and FNAL.
Excellent data are accumilating over a wide range of mnnenta, from 4 GeV/c
at ANL to the highest ISR energies. There are outstanding physics questions
we can investigate, such as the role of 2 + 3 unitarity; duality constraints
in exclusive final states, given an exotic initial state; the relationship
of 2 - 2 to 2 - 3, and of 2 - 3 to 2 +'X; resonance-background
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Berger, E.L. Developments in the phenomenology of two-to-three particle reactions, report, July 1, 1975; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc880533/m1/2/: accessed May 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.