A distinctive collection of essays, discussions, and personal descriptions of the evolution of particle physics.

This book presents an extended introduction to the theory of hadrons, the elementary particles that occur in the atomic nucleus. The main emphasis is on the theory of the complex angular momentum plane 'Regge theory'. In 1959 Tullio Regge demonstrated that it is useful to regard angular momentum as a complex variable when discussing solutions of the Schrödinger equation for non-relativistic potential scattering. This theory helps to classify the many different particles we know of, to explain the forces between them and to predict the results of high-energy scattering experiments. Regge theory thus serves as a unifying concept drawing together many different features of high-energy physics. This monograph is intended primarily for research students just beginning in particle physics, but experienced practitioners will also find much of interest. Originally published in 1977, this title has been reissued as an Open Access publication on Cambridge Core.

This past July about sixty physicists from sixteen different countries gathered at St. Croix in the United States Virgin Islands for an Advanced Study Institute (ASI) on Techniques and Concepts of High Energy Physics. The initial idea for the Institute arose one blustery and miserable day at Fermilab during discussions about all the wonderful summer schools that were prevalent throughout Europe but essentially nonexistent in the United States. I felt that it would be of great value to have an Institute that was located in a beautiful area and that catered primarily to the hard working experimenters who stoically suffer both the winter cold and summer heat at Fermilab. Summer schools in our field generally provide the very useful opportunity of meeting physicists who work along different lines of research, as well as the opportunity of keeping abreast of new developments. All schools tend to emphasize recent theoretical advances and phenomenology, while technical questions that are of great interest to experimenters are seldom discussed. It seemed appropriate therefore to organize a summer institute that would combine topics in accelerator design, data acquisition and the like, with the more standard theoretical fare. This is the general idea that prevailed in setting up the program of the Institute at St.

Almost all theories of fundamental interactions are nowadays based on the gauge concept. Starting with the historical example of quantum electrodynamics, we have been led to the successful unified gauge theory of weak and electromagnetic interactions, and finally to a non abelian gauge theory of strong interactions with the notion of permanently confined quarks. The. early theoretical work on gauge theories was devoted to proofs of renormalizability, investigation of short distance behaviour, the discovery of asymptotic freedom, etc . . , aspects which were accessible to tools extrapolated from renormalised perturbation theory. The second phase of the subject is concerned with the problem of quark confinement which necessitates a non-perturbative understanding of gauge theories. This phase has so far been marked by the introduc tion of ideas from geometry, topology and statistical mechanics in particular the theory of phase transitions. The 1979 Cargese Institute on "Recent Developments on Gauge Theories" was devoted to a thorough discussion of these non-perturbative, global aspects of non-abelian gauge theories. In the lectures and seminars reproduced in this volume the reader wilf find detailed reports on most of the important developments of recent times on non perturbative gauge fields by some of the leading experts and innovators in this field. Aside from lectures on gauge fields proper, there were lectures on gauge field concepts in condensed matter physics and lectures by mathematicians on global aspects of the calculus of variations, its relation to geometry and topology, and related topics.

This volume of proceedings comprises pedagogical lectures given by invited speakers and is intended for senior graduate students. The emphasis is on Heavy Quark Physics and Physics at the future Kaon, Tau-charm, Phi, and B-factories.