Search for Supersymmetry in Di-Photon Final States at sqrt{s} = 1.96 TeV

TL;DR

This paper reports a search for supersymmetry in di-photon events at the Fermilab Tevatron, finding no evidence of SUSY and setting new lower mass limits for neutralinos and charginos.

Contribution

First search for gauge-mediated supersymmetry in di-photon final states at the Tevatron, establishing the most stringent mass limits to date.

Findings

No significant excess observed over standard model background.

Set lower mass limits for neutralino (125 GeV) and chargino (229 GeV).

Analyzed 1.1 fb$^{-1}$ of data from the D0 experiment.

Abstract

We report results of a search for supersymmetry (SUSY) with gauge-mediated symmetry breaking in di-photon events collected by the D0 experiment at the Fermilab Tevatron Collider in 2002--2006. In 1.1 fb$^{-1}$ of data, we find no significant excess beyond the background expected from the standard model and set the most stringent lower limits to date for a standard benchmark model on the lightest neutralino and chargino masses of 125 GeV and 229 GeV, respectively, at 95% confidence.