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We present a refined and expanded analysis of the CDF $ee\gamma\gamma + \Et$event as superpartner production, assuming the lightest neutralino is thelightest supersymmetric particle. A general low-energy Lagrangian isconstrained by a minimum cross section times branching ratio into two electronsand two photons, kinematics consistent with the event, and LEP1-LEP130 data. Weexamine how the supersymmetric parameters depend on the kinematics, branchingratios and experimental predictions with a selectron interpretation of theevent, and discuss to what extent these are modified by other interpretations.Predictions for imminent CERN LEP upgrades and the present and future FermilabTevatron are presented. Finally, we briefly discuss the possible connection toother phenomena including a light stop, the neutralino relic density, the shiftin $R_b$ and the associated shift in $\alpha_s$, and implications for the formof the theory.Comment: 57 pages, LaTeX, uses epsf.sty, 19 figures. Version accepted for  publication in Phys. Rev. D, with minor changes and a few clarification

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Low energy supersymmetry with a neutralino LSP and the CDF<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ee</mml:mi><mml:mi>γ</mml:mi><mml:mi>γ</mml:mi><mml:mo>+</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi>E</mml:mi></mml:mrow><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>event

Low energy supersymmetry with a neutralino LSP and the CDFeeγγ+ETevent