Search for anomalous production of diphoton events with missing transverse energy at CDF and limits on gauge-mediated supersymmetry-breaking models

Abstract

We present the results of a search for anomalous production of diphoton events with large missing transverse energy using the Collider Detector at Fermilab. In $202\text{ }\text{ }\mathrm{p}{\mathrm{b}}^{\ensuremath{-}1}$ of $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{T}\mathrm{e}\mathrm{V}$ we observe no candidate events, with an expected standard model background of $0.27\ifmmode\pm\else\textpm\fi{}0.07(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\ifmmode\pm\else\textpm\fi{}0.10(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})$ events. The results exclude a lightest chargino of mass less than $167\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$, and lightest neutralino of mass less than $93\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$ at 95% C.L. in a gauge-mediated supersymmetry-breaking model with a light gravitino.