Abstract
As it is well known, the field of very high energy collisions of hadrons is dominated by the so-called inelastic processes. With increasing energy, more and more channelsopen; at present accelerator energies, at least 70–80% of the whole reaction can be attributed to inelastic processes and the unitarity condition assures us that even the elastic scattering is the shadow effect of the inelastic processes. It is, therefore, essential to understand the mechanism by which there inelastic processe (nowadays referred to also as “exclusive processes”)
proceed both in order to explain the experimentalfindings as well as to give an answer to many theoretical questions such as “what is, exactly, the Pomeron?” (or, equivalently, “what is diffraction?”), “what is a Regge pole?”, “what is the mechanism responsible for the large angle elastic scattering?” “can the manybody processes be simulated by sequences of two-step processes: a+b colliding give one or more excited states which subsequently decay into many particles?” and, in this case, ”what are the underlying dynamical mechanisms responsible for these two-step processes?” “does duality hold?“(i.e., can the above two-step process occur both if the collision is viewed as a direct (s) channel effect or as a crossed channel effect?) and, “o what extent does duality hold?”; “what is the origin of diffraction dissociation and of the so-called D-resonances?”, “how does one account for i) energy dependence, ii) angular distributions, iii) mass distribution, iv) multiplicities etc., of the exclusive processes?”, “what is the dynamical origin of the experimental damping in the transverse momenta?”; “how can one reconcile the present accelerator data with the (largely ignored) data on cosmic rays such as those found by the brazilian-japanese collaboration?”; on an even more fundamental ground: “what is the origin of a resonance and what is exactly a resonance?”; “ow do the various conservation laws play their role?” and “ow can unitarity be enforced and what is (if it exists) its relationship with crossing (suggested by duality)?”
Lecture given at XI. Internationale Universitätswochen für Kernphysik, Schladming, February 21 – March 4, 1972.
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Predazzi, E. (1972). Survey of High Energy Inelastic Models and Kinematical Constraints for Inclusive Processes. In: Urban, P. (eds) Elementary Particle Physics. Acta Physica Austriaca, vol 9/1972. Springer, Vienna. https://doi.org/10.1007/978-3-7091-4034-5_11
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