Section I: $$par p/pp;$$ Collisions.- Hard Scattering at ISR Energies.- Comparison of $$par p/pp;$$ Interactions at the ISR.- First Results of the UA1 Experiment.- Status and First Results from the UA2 Experiment.- Proton-Antiproton Elastic Scattering and Total Cross Section at the CERN Collider.- Results from the UA5 Experiment.- Section II: e+e? Collisions.- A Review of Two-Photon Physics.- Gluonium and QCD Effects in the J/? Region.- The Upsilon Resonances--Recent Results.- Electroweak Effects in e+e? Annihilations.- Section III: Jets.- Jets at PETRA.- Recent Results from the MAC and MARK II Detectors at PEP.- The Dynamics of a Fragmentation Model or a Possible Life after the Parton Stage.- Section IV: Structures in Hadronic Interaction and Heavy Flavors.- Event Structure in Collider and Cosmic Ray Experiments.- QCD and theSpace-Time Evolution of High-Energy e+e?, $$par p$$, and Heavy Ion Collisions.- Hadronic Production of Heavy Flavours.- The Decay of Heavy Flavor States in e+e? Annihilations.- Section V: Overview.- Is There a Desert Beyond the Mountains?.- Participants.
The field of particle physics is developing very rapidly. During this past year, physicists added a new instrument to their arsenal for the study of quark-quark, quark-lepton, and lepton lepton interactions. This machine, the PROTON-ANTIPROTON COLLIDER, achieved the highest energy in the world. With its five detectors, it is beginning to explore hitherto inaccessible regions for new physics (Section I). Lepton-Iepto~ machines with detectors at full efficiency are producing copious data of the very highest precision. The possibility of glueballs and the detailing of the properties of the upsilon family have been of major importance this year (Section II). The particle jets which are believed to be direct manifesta tions of the quark structure of matter continue to provide valuable data against which we can test the ideas of QCD (Section III). With the advent of more and better data it is now possible to study in detail the formation evolution of hadronic states. Especially interesting are the properties of heavy quark states (Section IV). A far-seeing look into the future development of any fecund scienti fic field is rarely accurate, but is always stimulating (Section V). It is against this background of participating in the clarifi cation of the Physics in Collision that we continue this series.
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