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|Title:||Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector|
Abed Abud, A.
Adam Bourdarios, C.
|Citation:||Journal of High Energy Physics, 2020; 2020(11):5-[i]1-5-40|
|G. Aad … A. Duvnjak … P. Jackson … A.X.Y. Kong … J.L. Oliver … A. Petridis … A Qureshi … A.S. Sharma … M.J. White … et al. [The ATLAS Collaboration]|
|Abstract:||A search for new physics with non-resonant signals in dielectron and dimuon final states in the mass range above 2 TeV is presented. This is the first search for non-resonant signals in dilepton final states at the LHC to use a background estimate from the data. The data, corresponding to an integrated luminosity of 139 fb⁻¹, were recorded by the ATLAS experiment in proton-proton collisions at a center-of-mass energy of s√ = 13 TeV during Run 2 of the Large Hadron Collider. The benchmark signal signature is a two-quark and two-lepton contact interaction, which would enhance the dilepton event rate at the TeV mass scale. To model the contribution from background processes a functional form is fit to the dilepton invariant-mass spectra in data in a mass region below the region of interest. It is then extrapolated to a high-mass signal region to obtain the expected background there. No significant deviation from the expected background is observed in the data. Upper limits at 95% CL on the number of events and the visible cross-section times branching fraction for processes involving new physics are provided. Observed (expected) 95% CL lower limits on the contact interaction energy scale reach 35.8 (37.6) TeV.|
|Keywords:||Hadron-hadron scattering (experiments)|
|Rights:||Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP³. Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.|
|Appears in Collections:||Physics publications|
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