# Search for contact interactions and large extra dimensions in the dilepton channel using proton-proton collisions at √s = 8 TeV with the ATLAS detector

Abstract : 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 √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 new physics parameters of interest at the 95% credibility level. For $\ell\ell q q$ contact interactions, lower limits are set on the contact interaction scale $\Lambda$ between 15.4 TeV and 26.3 TeV. Lower limits are also set on the string scale $M_{S}$ for large extra spatial dimensions, from 4.1 TeV to 6.1 TeV.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01022633
Contributor : Sabine Starita <>
Submitted on : Tuesday, June 1, 2021 - 5:18:36 PM
Last modification on : Thursday, June 17, 2021 - 3:46:23 AM

### File

1407.2410.pdf
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### Citation

G. Aad, A. Bassalat, C. Becot, S. Binet, C. Bourdarios, et al.. Search for contact interactions and large extra dimensions in the dilepton channel using proton-proton collisions at √s = 8 TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2014, 74 (12), pp.3134. ⟨10.1140/epjc/s10052-014-3134-6⟩. ⟨in2p3-01022633⟩

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