The Challenging Questions, Softcover reprint of the original 1st ed. 1990 The Subnuclear Series, Vol. 21

During July-August 1989. a group of 75 physicists from 52 laboratories in 16 countries met in Erice for the 27th Course of the International School of Subnuclear Physics. The countries represented were: Austria. Bulgaria. Canada. China. Denmark. France. the Federal Republic of Germany. Hungary. India. Italy. Pakistan. Poland. Switzerland. United Kingdom. and the Union of the Soviet Socialist Republics and the United States of America. The School was sponsored by the European Physical Society (EPS). the Italian Ministry of Education (MPI). the Italian Ministry of Scientific and Technological Research (MRST). the Sicilian Regional Government (ERS). and the Weizmann Institute of Science. In addition to some crucial problems in the Superworld Theory. developed by S. Ferrara and L. Hall. the School was focused on the most advanced topics which have attracted our attention during the last year. These are of a phenomenological nature: the problem of the spin inside the proton (G. Altarelli). some crucial QCD tests (R. Baldini-Celio and S. Brodsky). the jet phenomenology as predicted by QCD (Y. Dokshitzer); and of basic (therefore by far more difficult to solve) value. such as the understanding of the fundamental constants of Nature (G. Veneziano) and the new ideas on the cosmological constant (A. Stominger and G. Veneziano).

Opening Lecture.- The Champions of the Universe.- Theoretical Lectures.- Dark Matter.- Polarized Electroproduction and the Spin of the Quarks inside the Proton.- Quantum Chromodynamics of Hadron Jets.- Considerations on the Moduli Space of Calabi-Yau Manifolds.- Exotic Signatures from Supersymmetry.- Baby Universes and the Cosmological Constant Problem.- Recent Ideas on the Cosmological Constant Problem.- Review Lectures.- Quantum Strings and the Constants of Nature.- The LAA Project — Second Year of Activity.- Seminars on Specialized Topics.- A Crucial Test for QCD: The Time-like E.M. Form Factors of the Neutron.- Challenges to Quantum Chromodynamics: Anomalous Spin, Heavy Quark, and Nuclear Phenomena.- Prizes and Scholarships.- Participants.