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 root s = 7 TeV at the CERN Large Hadron Collider and correspond to an integrated luminosity of 3: 1 pb(-1). 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 < 729 GeV are excluded at 95% C. L., providing the most sensitive limit on this model to date. RI valente, paolo/A-6640-2010; Rotaru, Marina/A-3097-2011; Stoicea, Gabriel/B-6717-2011; Lin, SC/G-4666-2010; Buttar, Craig/D-3706-2011; de Groot, Nicolo/A-2675-2009; Fazio, Salvatore /G-5156-2010; Castro, Nuno/D-5260-2011; Doyle, Anthony/C-5889-2009; Andreazza, Attilio/E-5642-2011; Jakubek, Jan/E-6530-2011; Marti-Garcia, Salvador/F-3085-2011; Conde Muino, Patricia/F-7696-2011; Robson, Aidan/G-1087-2011; Kladiva, Eduard/G-6305-2011; Losada, Marta/B-2261-2010; Bauer, Florian/G-8816-2011; Jones, Roger/H-5578-2011; Gutierrez, Phillip/C-1161-2011; Ferrando, James/A-9192-2012; collins-tooth, christopher/A-9201-2012; Perrino, Roberto/B-4633-2010; De Cecco, Sandro/B-1016-2012; branchini, paolo/A-4857-2011; Wolter, Marcin/A-7412-2012; O'Shea, Val/G-1279-2010; Nemecek, Stanislav/C-3487-2012; Takai, Helio/C-3301-2012; St.Denis, Richard/C-8997-2012; Britton, David/F-2602-2010; Pina, Joao /C-4391-2012; Li, Xuefei/C-3861-2012; Smirnova, Lidia/D-8089-2012; Smirnov, Sergei/F-1014-2011; Gladilin, Leonid/B-5226-2011; Kramarenko, Victor/E-1781-2012; Prokoshin, Fedor/E-2795-2012; Alexa, Calin/F-6345-2010; Pacheco Pages, Andres/C-5353-2011; Moorhead, Gareth/B-6634-2009; Livan, Michele/D-7531-2012; Petrucci, Fabrizio/G-8348-2012; Wemans, Andre/A-6738-2012; Fabbri, Laura/H-3442-2012; Kurashige, Hisaya/H-4916-2012; Villa, Mauro/C-9883-2009; Kuzhir, Polina/H-8653-2012; Delmastro, Marco/I-5599-2012

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