Searches for New Physics in Diphoton Events in proton anti-proton collisions at sqrt(s)=1.8TeV

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We present a detailed description of a search for anomalous production of missing Eₜ (), jets, leptons (e, μ, τ), b-quarks, or additional photons in events containing two isolated, central (|η|<1.0) photons with > 12 GeV. 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. We set limits using two specific SUSY scenarios for production of diphoton events with.