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Search for contact interactions and large extra dimensions in the dilepton channel using proton-proton collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

The collaboration
Eur.Phys.J. C74 (2014) 3134, 2014

Abstract (data abstract)
CERN-LHC. A search is conducted for non-resonant new phenomena in dielectron and dimuon final states, originating from either contact interactions or large extra spatial dimensions. The LHC 2012 proton-proton collision dataset recorded by the ATLAS detector is used, corresponding to 20 fb$^{-1}$ at $\sqrt{s}$ = 8 TeV. The dilepton invariant mass spectrum is a discriminating variable in both searches, with the contact interaction search additionally utilizing the dilepton forward-backward asymmetry. No significant deviations from the Standard Model expectation are observed. Lower limits are set on the $\ell\ell q q$ contact interaction scale $\Lambda$ between 15.4 TeV and 26.3 TeV, at the 95% credibility level. For large extra spatial dimensions, lower limits are set on the string scale $M_{S}$ between 3.2 TeV to 5.0 TeV.

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Data from Figure 1 (top)

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Reconstructed dielectron mass distributions for data and the SM background estimate.

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Data from Figure 1 (bottom)

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Reconstructed dimuon mass distributions for data and the SM background estimate.

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Data from Figure 2 (top)

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Reconstructed $\cos\theta^*$ distributions for data and the SM background estimate in the dielectron channel.

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Data from Figure 2 (bottom)

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Reconstructed $\cos\theta^*$ distributions for data and the SM background estimate in the dimuon channel.

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Data from Figure 3 (top)

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Reconstructed $A_{\rm FB}$ distributions for data and the SM background estimate as a function of dielectron mass.

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Data from Figure 3 (bottom)

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Reconstructed $A_{\rm FB}$ distributions for data and the SM background estimate as a function of dimuon mass.

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Data from Figure 4

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Summary of 95% C.L. lower exclusion limits on $\Lambda$ for the combined dilepton contact interaction search, using a uniform positive...

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Data from Figure 5

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Summary of 95% C.L. lower exclusion limits on $M_{\rm S}$ for the combined dilepton ADD large extra dimensions search, using...

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Data from Auxiliary Figure 9a

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Reconstructed $\cos\theta^*$ distributions for data and the SM background estimate in the electron channel.

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Data from Auxiliary Figure 9b

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Reconstructed $\cos\theta^*$ distributions for data and the SM background estimate in the muon channel.