[en] The use of the Crystal Ball detector for the study of e⁺e^- annihilations near charm threshold - at the psi(3097), psi'(3685), psi'(3770) and in the continuum 3770 less than or equal to √s less than or equal to 4500 MeV - is discussed. This paper will concentrate on the special techniques available to the Crystal Ball which allow measurement of inclusive γ, π⁰ and eta cross sections. Preliminary results for these processes at particular center of mass energies are presented. An update of the inclusive and exclusive evidence for the eta/sub c/(2980), for the sake of completeness, is given in the Appendix

[en] Selected topics in the investigations of decays of members of the Upsilon family are examined; the confrontation of theory with experiment is not yet adequate. The current evidence regarding the zeta(8322 MeV) is reviewed and future directions of study are indicated. 15 references

[en] Evidence for three new particles observed in the Crystal Ball detector is presented. The first particle, at 3592 MeV, is seen inclusively in γ transitions from psi', and is thus a candidate for eta/sub c/'. The other two, at 1440 and 1640 MeV, are best seen in exclusive decays of psi involving a prompt γ, and are thus candidates for bound states of two gluons. Detailed reasons are presented to support the contention that these states are distinct from previously observed candidates such as E(1420). Alternative hypotheses are discussed

[en] Evidence for three new particles observed in the Crystal Ball detector is presented. The first particle, at 3592 MeV, is seen inclusively in γ transitions from psi', and is thus a candidate for eta/sub c/'. The other two, at 1440 and 1640 MeV, are best seen in exclusive decays of psi involving a prompt γ, and are thus candidates for bound states of two gluons. Detailed reasons are presented to support the contention that these states are distinct from previously observed candidates such as E(1420). Alternative hypotheses are discussed

[en] Apparatus originally intended to operate separately as a charged-particle spectrometer and an e⁺e^-→e⁺e^- (+hadrons) detector have been combined to form a γ-spectrometer at SPEAR II. The main detector is highly segmented NaI subtending an effective 21% of 4π solid angle. Charged particle detection is available over 95% of 4π, but only a negligible part of this includes momentum or particle identification. Integrated luminosities of approximately 541 nb^-1 at psi' and 104 nb^-1 at psi have been collected. The resolution calibrations and preliminary, nonquantitative results on inclusive and exclusive channels are discussed

No abstract available

[en] Selected topics in the investigations of decays of members of the Upsilon family are examined; the confrontation of theory with experiment is not yet adequate. The current evidence regarding the zeta(8322 MeV) is reviewed and future directions of study are indicated. 15 refs.

[en] The hadronic decays of heavy quark-antiquark 1³S₁ resonances such as the psi/J or UPSILON can provide an ideal laboratory for studying the properties of gluon jets. The predictions of QCD perturbation theory for gluon-jet structures, hadronic multiplicities, fragmentation distributions, and angular distributions are discussed. In particular the channel (Qanti Q)→γ+X, whose rate, spectrum, and angular distribution are predicted in lowest order, should allow the study of the jet and resonance structure produced via two intermediate gluons. (Auth.)

[en] Cross sections are presented for all final states without strange-particle production. Contributions to single-pion production are found from (i) Δ (1238) π, (ii) rho⁺p, (iii) nucleon diffractive dissociation into Nπ, (iv) N* (1688) π⁺, and (v) ''phase space.'' Processes (i), (ii), and (iii) are studied in some detail taking into account overlaps between the various subchannels

[en] The calorimetric and fluorescence properties of Bismuth Germanate are discussed and compared to those of NaI(Tl). Results on the energy resolution of BGO are presented for energies up to 50 MeV; the energy and position resolution are studied by Montecarlos at higher energies. The performance of a 4π BGO e.m. calorimeter is compared to that of NaI and is specified for a compact fieldless calorimeter designed for the Z⁰ energy region. Cost, optical uniformity and radiation sensitivity are areas needing further work before a large BGO detector can be built