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Using data recorded in 2011 with the ATLAS detector at the Large HadronCollider, a search for evidence of extra spatial dimensions has been performedthrough an analysis of the diphoton final state. The analysis uses datacorresponding to an integrated luminosity of 2.12 fb^-1 of sqrt(s) = 7 TeVproton-proton collisions. The diphoton invariant mass spectrum is observed tobe in good agreement with the expected Standard Model background. In the largeextra dimension scenario of Arkani-Hamed, Dimopoulos and Dvali, the resultsprovide 95% CL lower limits on the fundamental Planck scale between 2.27 and3.53 TeV, depending on the number of extra dimensions and the theoreticalformalism used. The results also set 95% CL lower limits on the lightestRandall-Sundrum graviton mass of between 0.79 and 1.85 TeV, for values of thedimensionless coupling k/\bar{M}_{Pl} varying from 0.01 to 0.1. Combining withpreviously published ATLAS results from the dielectron and dimuon final states,the 95% CL lower limit on the Randall-Sundrum graviton mass for k/\bar{M}_{Pl}= 0.01 (0.1) is 0.80 (1.95) TeV.

Search for extra dimensions using diphoton events in 7 TeV proton-proton collisions with the ATLAS detector