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

• Main Author: Taylor, Frank E. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor)
• Format: Article
• Language: English
• Published: Elsevier, 2014-12-03T18:42:18Z.
• Subjects: Article
• Online Access: Get fulltext

 Using data recorded in 2011 with the ATLAS detector at the Large Hadron Collider, a search for evidence of extra spatial dimensions has been performed through an analysis of the diphoton final state. The analysis uses data corresponding to an integrated luminosity of 2.12 fb[superscript −1] of √s = 7 TeV proton-proton collisions. The diphoton invariant mass (m[subscript γγ]) spectrum is observed to be in good agreement with the expected Standard Model background. In the large extra dimension scenario of Arkani-Hamed, Dimopoulos and Dvali, the results provide 95% CL lower limits on the fundamental Planck scale between 2.27 and 3.53 TeV, depending on the number of extra dimensions and the theoretical formalism used. The results also set 95% CL lower limits on the lightest Randall-Sundrum graviton mass of between 0.79 and 1.85 TeV, for values of the dimensionless coupling [k over [bar over M subscript Pl]] varying from 0.01 to 0.1. Combining with previously published ATLAS results from the dielectron and dimuon final states, the 95% CL lower limit on the Randall-Sundrum graviton mass for [k over [bar over M subscript Pl]] = 0.01 (0.1) is 0.80 (1.95) TeV.