Scientific article

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

ContributorsATLAS Collaboration
Published inPhysics letters. B, vol. 710, no. 4-5, p. 538-556
Publication date2012

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−12.12 fb−1 of √s=7 TeV proton–proton collisions. The diphoton invariant mass (mγγmγγ) 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/MPl 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/MPl=0.01 (0.1) is 0.80 (1.95) TeV.

Citation (ISO format)
ATLAS Collaboration. Search for extra dimensions using diphoton events in 7 TeV proton–proton collisions with the ATLAS detector. In: Physics letters. B, 2012, vol. 710, n° 4-5, p. 538–556. doi: 10.1016/j.physletb.2012.03.022
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Article (Published version)
ISSN of the journal0370-2693

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