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

We have searched for anomalous production of missing E$_{\rm T}$ ($\mett$), jets, leptons ($e, μ, τ$), $b$-quarks, or additional photons in events containing two isolated, central \mbox{($|η|<1.0$)} photons with \mbox{$\Et>12$~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-E$_{\rm T}$ electromagnetic cluster, and large $\mett$. We set limits using two specific SUSY scenarios for production of diphoton events with $\mett$.