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

Tanasijczuk, Andres Jorge;ATLAS;et.al.
(2014) European Physical Journal C — Vol. 74 (2014)

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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 marc: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 $M_\mathrm{S}$ between 3.2 TeV to 5.0 TeV.
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Tanasijczuk, A. J., ATLAS, & et al. (2014). 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. European Physical Journal C, 74. https://doi.org/10.1140/epjc/s10052-014-3134-6 (Original work published 2014)