Search for Anomalous Production of Diphoton Events with Missing Transverse Energy at CDF and Limits on Gauge-Mediated Supersymmetry-Breaking Models

TL;DR

This paper reports a search for anomalous diphoton events with missing energy at Fermilab, finding no candidates and setting new limits on supersymmetry particle masses within gauge-mediated models.

Contribution

It provides the first experimental limits on chargino and neutralino masses in gauge-mediated supersymmetry-breaking models using diphoton plus missing energy data.

Findings

No candidate events observed, consistent with background expectations.

Excluded chargino masses below 167 GeV/c^2 at 95% confidence level.

Excluded neutralino masses below 93 GeV/c^2 at 95% confidence level.

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 $\invpb$ of $\ppbar$ collisions at $\sqrt{s}=1.96$ TeV we observe no candidate events, with an expected standard model background of $0.27\pm0.07({\rm stat})\pm0.10({\rm syst})$ events. The results exclude a lightest chargino of mass less than 167 GeV/$c^2$, and lightest neutralino of mass less than 93 GeV/$c^2$ at 95% C.L. in a gauge--mediated supersymmetry-- breaking model with a light gravitino.