Role of relativity and nucleon compositeness in few-body systems

Abstract

Recent progress is reviewed in four areas where new experimental data have been obtained: proton-proton bremsstrahlung, threshold pion production in proton-proton collisions, elastic electron-deuteron scattering and deuteron photodisintegration at several GeV photon energy. Relativistic effects are expected to be significant in these processes. High energy photodisintegration suggests that partonic behavior could be relevant in subamplitudes at large momentum transfer.

Comments: Invited talk at XVII European Conference on Few-Body Problems in Physics, Sept. 11-16, 2000, Evora, Portugal. (12 pages, 2 postscript figures)