Search for extra dimensions using diphoton events in 7 TeV proton–proton collisions with the ATLAS detector
Author(s)Taylor, Frank E.
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physics Letters B
Aad, G., B. Abbott, J. Abdallah, A.A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi, et al. “Search for Extra Dimensions Using Diphoton Events in 7 TeV Proton–proton Collisions with the ATLAS Detector.” Physics Letters B 710, no. 4–5 (April 2012): 538–556. © 2012 CERN
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