Search for extra dimensions using diphoton events in 7 TeV proton-proton collisions with the ATLAS detector ATLAS Collaboration
2012 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 710, no 4-5, 538-556 p.Article in journal (Refereed) Published
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(-1) of root s = 7 TeV proton-proton collisions. The diphoton invariant mass (m(gamma gamma)) 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/(M) over bar (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/(M) over bar (Pl) = 0.01 (0.1) is 0.80 (1.95) TeV.
Place, publisher, year, edition, pages
2012. Vol. 710, no 4-5, 538-556 p.
Photon Pair Production, Parton Distributions, Contact Interactions, Physics, Hierarchy, Colliders, Gravity, Signals, Model, Hera
IdentifiersURN: urn:nbn:se:kth:diva-101083DOI: 10.1016/j.physletb.2012.03.022ISI: 000303221800006ScopusID: 2-s2.0-84862776558OAI: oai:DiVA.org:kth-101083DiVA: diva2:546338
QC 20120823. Author count: 3035.2012-08-232012-08-23Bibliographically approved