Searches for new physics in diphoton events in pp[over ¯] collisions at sqrt[s]=1.8 TeV

We present a detailed description of a search for anomalous production of missing ET (E/T), jets, leptons (e,μ,τ), b quarks, or additional photons in events containing two isolated, central (|η|<1.0) photons with ET>12GeV. The results are consistent with standard model expectations, with the possible exception of one event that has, in addition to the two photons, a central electron, a high-ET electromagnetic cluster, and large E/T. We set limits using two specific SUSY scenarios for production of diphoton events with E/T.