abstract

Contents: 1. Phenomenology, 2. Current commutators and light cone behaviour, 3. Dynamical models, 4. Quantum electrodynamics at infinite momentum.

abstract

It is shown that a straightforward generalization of the multiple diffractive scattering model used in high energy nuclear collisions leads to the correct expressions for the high energy limits of the cross-sections of various quantumelectrodynamical processes.

abstract

The main object of these lectures will be to focus attention on some of the many uses of heavy atomic nuclei in high energy particle physics. As we shall see the physics of production and scattering of high energy particles on nuclei and on nucleons can be profitably investigated together and we shall do so. A partial list of the information one can get from studying high energy reactions in nuclei includes

1. The determination of unstable particle cross-sections and scattering amplitudes.
2. Information on coupling constants e.g. the vector dominance coupling constants \(\gamma _V\) and possibly couplings between unstable particle e.g. \(g_{\omega ,\varphi ,{\rm Pomeron}}\).
3. Information on how asymptotia is approached in elastic scattering of \(K\)-mesons from nucleons (using coherent regeneration).
4. Information on hadron–hadron diffraction mechanisms e.g. does double pomeron exchange have meaning?
5. An answer to the question: Is vector dominance a good approximation over large ranges of “photon mass”.
6. \(K^0\) electric form factor through the interference of regeneration of \(K^0\)s on atomic electrons with coherent regeneration from nuclei.
7. The lifetimes of \(\pi ^0, \eta , \eta ^{\prime }, \dots \) through Coulomb photoproduction in the field of a heavy nucleus.
8. Off diagonal couplings of hadrons with photons, e.g. \(NN^*\gamma , KK^*\gamma \) through Coulomb production of the unstable hadrons.
9. Information on the dynamics of weak interactions, e.g. the deduction of neutrino–nucleon cross-sections from neutrino interaction with a block of iron.
10. A big nucleus may be useful for copious production of particles through cascade processes.

We will concentrate in these lectures on the calculation of some of these processes in nuclei and also to some extent on the phenomenology of diffraction on hadrons. The treatment will involve a rather physical approach with minimal emphasis on derivations.

abstract

This afternoon I would like to tell you about some physics that was started at Brookhaven several years ago. The work was an experimental study of the interaction of 1 GeV protons with nuclei.

abstract

Some advantages of the use of log tan \(\theta \) variable in the analysis of the experimental data, on the multiple particle production at very high energies are given. A selection of a few well established observations concerning this phenomenon in collisions at TeV energies are presented.

abstract

I shall limit myself to one aspect of the recent developments in the study of the Veneziano model, i.e., to symmetric representations of the \(n\)-point function and their implications. To be self-contained, however, the first half will be an elementary introduction to the conventional way of construction of the Veneziano \(n\)-point function [1]. My subject may be deviating from the main lines of this meeting, but, hopefully, not so much. One additional feature of the \(n\)-point function is that it satisfies the bootstrap condition, so that external as well as internal particles are equally “composite”. In fact, some of the characteristic features of this model can be easily understood as these of interaction of composite systems.

abstract

I should like to give a short account of the problems investigated or already solved in hypernuclear studies and to mention the perspectives for the future especially in the case of the hypernuclear spectroscopy. A part of my lecture summarizes some of the results presented last year at the Hypernuclear Conference in Argonne (Proceedings of International Conference on Hypernuclear Physics, Argonne 1969).