[en] Discovery of the J particles (psi-3105 and psi-3695) is detailed. A few experiments on the production of J particles are described, emphasizing photoproduction of J's by photons and hadrons. Finally, current theoretical attempts at explaining their origin are outlined. (29 figures) (U.S.)

[en] The historical development of the discovery of the J particle is described. Implications of this discovery and some subsequent developments are also noted. 44 references

[en] This book examines present experimental knowledge on branching ratios, lifetimes, cross sections, and production mechanisms of charm and heavy flavors. The bases of the theoretical ideas and predictions, and such experimental methods as triggers, techniques, and devices are discussed. Topics covered include the search for charm and beauty with e⁺e^- beams, the search for charm and beauty at Fermilab, the search for charm with bubble chambers, the use of visual detectors in the search for charm and other flavors, lifetime measurements, live targets for lifetime measurements, production cross sections of charm and new flavors, high resolution vertex detectors to search for charm and other flavors, the search for heavy flavors, and special triggers to search for charm and heavy flavors. The contributors participated in the Europhysics Study Conference on High-Energy Physics held in Italy in 1981

[en] PETRA, an e⁺e- storage ring located in Hamburg, Germany, is schematicized. Its klystrons, and vacuum pipe focusing structure (FODO) are specified. Attempts made to measure beam polarization are reported on. The MARK J detector, designed to measure and distinguish hadrons, electrons, neutral particles, and muons, is also shown. The validity of QED is tested using the e⁺e- reaction, as started at the Bologna-CERN group at ADONE. But at PETRA the MARK J group has measured the Bhabha reaction to much smaller distances such that the acoplanarity angle delta-/phi/ in the detector with large-angle Bhabha scattering may be shown. Hadron final states are studied. A jet analysis of hadronic events was performed using the spatial distribution of the energy deposited in the detector. The possible effect of gluon emission is studied in greater detail. Finally, TASSO, PLUTO (the first group to show the upsilon decay into three gluons), and JADE are specified

[en] The discovery and origin of the J particle are discussed. Design of the experimental and the set-up as well as first results are given. The mass spectra and width of J are plotted. 35 references

[en] A description is given of a search for narrow resonances using the p + p interaction in the mass region 1.2 to 5.0 GeV. A search for multiparticle final states using the reaction p + Be is also outlined

[en] One of the most important tasks an experimental physicist has is to select the right experiment to perform at the right accelerator at the right time. In the next ten years, the high energy physics community will be fortunate to have opportunities to work on (1) the 100 GeV e⁺e^- colliding beam accelerator in Geneva, Switzerland, known as LEP; (2) a 2 TeV p anti p collider at FNAL; or (3) the high intensity 800 GeV proton-proton collider, ISABELLE. The principal physics interests for LEP would be the study of Z⁰ physics, which includes the counting of neutrinos, the searching for Higgs, and the measuring of the weak angle, sin² theta/sub w/. LEP will also be useful in the search for new quark-antiquark states such as toponium. Experiments on strong interactions off resonance are very difficult to perform. This is because the hadron production cross section is very small at √s approx. 100 GeV. It would be difficult to obtain more than a few hundred hadron events per year at LEP. The p anti p collider at Fermilab will certainly explore some of the strong interaction physics at TeV regions and will be more competitive than the CERN p anti p collider at 540 GeV. However, because of the luminosity limitations it perhaps will not have the capacity to search for new particles much beyond 100 GeV mass. The principal physics interest at ISABELLE would be the utilization of its high luminosity to search for new, unpredicted phenomena, thus making a fundamental advance in our understanding of particle physics

[en] Results of studies of the psi particles using the DESY storage rings are described. Some of the phenomena examined are the e⁺e^- elastic scattering in the neighborhood of the 3.1 GeV resonance, production at psi (3.7), neutral final state decay modes of psi (3.1) and psi (3.7), two-body hadronic decays, cascade decays of psi (3.7) → psi (3.1) + X, and inclusive π^+-, K^+-, and antiproton yields at the 3.1, 3.7, and 4.1 resonances

[en] A few experiments are described which demonstrate the similarities between photons and vector mesons. Detailed descriptions are provided for the photoproduction of the rho meson on complex nuclei, determination of photoproduction phase of rho mesons, observations of coherent interference between rho and ω decays in the reactions γ + Be → V⁰(rho,ω) → Be + e⁺e^-, and determination of rho-ω interference parameters from photoproduction of vector mesons off hydrogen, carbon, and lead

[en] The production of new particles from proton--proton interactions was studied in a high sensitivity experiment in which narrow width particles were detected over a wide mass region. A real massive particle J → e⁺e^- was observed having a width smaller than 5 MeV/c². The yield of J was found