Scattering Theory: Unitarity, Analyticity And Crossing

Lecture Notes in Physics Edited by J. Ehlers, Austin, K. Hepp, Zerich and H. A. WeidenmL~ller, Heidelberg Managing Editor: W. Beiglb6ck, Heidelberg 3 Andre Martin CERN, Geneve Scattering Theory: Unitarity, Analyticity and Crossing Notes taken by R. Schrader, ZUrich ¢ Springer-Verlag Berlin-Heidelberg New York 1969 This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. Under § 54 of the German Copyright Law where copies are made for other the amount of the fee to be determined by agreement with the publisher. 0 by Springer-Verlag Title No. 3322 Berlin Heidelberg 1969. Library of Congress Catalog than private use, a fee is payable Card Number 70-106192 to the publisher, Printed in Germany. Foreword These lecture notes are based on a course that I gave at the Swiss Federal Institute of Technology during the Summer Semester 1969 at the invitation of Professors M. Fierz, K. Hepp and R. Jost. I am extremely grateful to them for this opportunity they gave me to teach on my favourite subject. Dr. R. Schrader has been kind enough to accept to take notes and reconstruct a coherent version of what I said. If the reader is dissatisfied with the presentation of the material contained in the lecture notes I am to blame because I think that Dr. Schrader did a very good job in disentangling my aineous progression and restating in a more correct mathematical language what I said. Dr. Schrader and I are also very much indebted to Dr. 0. Chandler and Prof. K. Hepp who critically read the manuscript and eliminated the most obvious gr