Search for diphoton events with large missing transverse momentum in 7 TeV proton-proton collision data with the ATLAS detector

TL;DR

This paper reports a search for diphoton events with large missing transverse momentum in 7 TeV proton-proton collisions, setting new exclusion limits on various supersymmetry and extra dimension models using ATLAS data.

Contribution

First search for diphoton plus missing energy events at 7 TeV with ATLAS, establishing the most stringent limits on gauge-mediated supersymmetry breaking and extra dimensions.

Findings

No excess events observed over Standard Model predictions.

Excluded gluino masses below 1.07 TeV and squark masses below 0.87 TeV.

Excluded compactification scales below 1.40 TeV for universal extra dimension models.

Abstract

A search for diphoton events with large missing transverse momentum has been performed using proton-proton collision data at sqrt(s) = 7 TeV recorded with the ATLAS detector, corresponding to an integrated luminosity of 4.8 fb^-1. No excess of events was observed above the Standard Model prediction and model-dependent 95% confidence level exclusion limits are set. In the context of a generalised model of gauge-mediated supersymmetry breaking with a bino-like lightest neutralino of mass above 50 GeV, gluinos (squarks) below 1.07 TeV (0.87 TeV) are excluded, while a breaking scale Lambda below 196 TeV is excluded for a minimal model of gauge-mediated supersymmetry breaking. For a specific model with one universal extra dimension, compactification scales 1/R < 1.40 TeV are excluded. These limits provide the most stringent tests of these models to date.