Why New Forces of Nature Should Exist

Abstract

Are quarks and leptons composite? Do we have further substructure? Are there new fundamental forces, binding subquarks inside quarks? Is it possible that some of the bosons of the standard model (especially W and Z) are composite? Is the weak interaction fundamental or is it a residue of new interactions? What are the experimental limits on substructure? What do we know about composite model building? These are the subjects covered in the lectures of Haim Harari. A full discussion appears in “Composite Quarks and Leptons”, lectures by H. Harari at the 1984 Scottish Universities Summer School, St. Andrews, Scotland and in “Compositeness”, talk by H. Harari at the 5th Topical Workshop on Proton-Antiproton Collider Physics, St. Vincent, Aosta Valley, Italy, 1985 (World Scientific).