Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector

ATLAS Publications, T.M. Carter, M. Faucci Giannelli, A. Hasib, M.P. Heath, S. Palazzo, A. Søgaard, A. Strubig, E.P. Takeva, A.J. Taylor, N. Themistokleous, E.M. Villhauer

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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.
Original languageEnglish
Article number5
Pages (from-to)1-40
Number of pages40
Journal Journal of High Energy Physics
Volume2020
Issue number11
DOIs
Publication statusPublished - 4 Nov 2020

Keywords / Materials (for Non-textual outputs)

  • Hadron-Hadron scattering (experiments)

Fingerprint

Dive into the research topics of 'Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector'. Together they form a unique fingerprint.

Cite this