Search for Diphoton Events with Large Missing Transverse Energy in 7 TeV Proton-Proton Collisions with the ATLAS Detector

TL;DR

This paper reports a search for diphoton events with large missing transverse energy in 7 TeV proton-proton collisions, finding no excess and setting new limits on a Universal Extra Dimension model.

Contribution

First search for diphoton plus missing energy events at 7 TeV with ATLAS, establishing the most sensitive limit on the UED model to date.

Findings

No excess events observed above Standard Model background.

Excluded 1/R values below 728 GeV at 95% confidence level.

Set new constraints on Universal Extra Dimension models.

Abstract

A search for diphoton events with large missing transverse energy is presented. The data were collected with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV at the CERN Large Hadron Collider and correspond to an integrated luminosity of 3.1/pb. No excess of such events is observed above the Standard Model background prediction. In the context of a specific model with one Universal Extra Dimension with compactification radius R and gravity-induced decays, values of 1/R < 728 GeV are excluded at 95% CL, providing the most sensitive limit on this model to date.