Search for extra dimensions in diphoton events from proton–proton collisions at $\sqrt {s} = 7\,$ TeV in the ATLAS detector at the LHC

Barton, Adam and Borissov, Guennadi and Bouhova-Thacker, Eva and Chilingarov, Alexandre and Davidson, Ruth and de Mora, Lee and Dearnaley, William and Fox, Harald and Henderson, Robert and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin and Love, Peter and Maddocks, Harvey and Smizanska, Maria and Walder, James (2013) Search for extra dimensions in diphoton events from proton–proton collisions at $\sqrt {s} = 7\,$ TeV in the ATLAS detector at the LHC. New Journal of Physics, 15 (4). ISSN 1367-2630

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The large difference between the Planck scale and the electroweak scale, known as the hierarchy problem, is addressed in certain models through the postulate of extra spatial dimensions. A search for evidence of extra spatial dimensions in the diphoton channel has been performed using the full set of proton–proton collisions at $\sqrt {s} = 7\,{\mathrm { TeV}}$ recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. This dataset corresponds to an integrated luminosity of 4.9 fb−1. The diphoton invariant mass spectrum is observed to be in good agreement with the Standard Model expectation. In the context of the model proposed by Arkani–Hamed, Dimopoulos and Dvali, 95% confidence level lower limits of between 2.52 and 3.92 TeV are set on the ultraviolet cutoff scale MS depending on the number of extra dimensions and the theoretical formalism used. In the context of the Randall–Sundrum model, a lower limit of 2.06 (1.00) TeV at 95% confidence level is set on the mass of the lightest graviton for couplings of ${k/\overline {M}_{\mathrm { Pl}}} = 0.1 (0.01)$ . Combining with the ATLAS dilepton searches based on the 2011 data, the 95% confidence level lower limit on the Randall–Sundrum graviton mass is further tightened to 2.23 (1.03) TeV for ${k/\overline {M}_{\mathrm { Pl}}} = 0.1 (0.01)$ .

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Journal Article
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New Journal of Physics
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© CERN 2013 for the benefit of the ATLAS Collaboration, published under the terms of the Creative Commons Attribution 3.0 licence by IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Any further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation and DOI.
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02 Dec 2013 14:43
Last Modified:
08 Jul 2020 03:56