Abstract
A search for high-mass dielectron and dimuon resonances in the mass range of 250 GeV to 6 TeV is presented. The data were recorded by the ATLAS experiment in proton-proton collisions at a centre-of-mass energy of √s=13 TeV during Run 2 of the Large Hadron Collider and correspond to an integrated luminosity of 139 fb−1. A functional form is fitted to the dilepton invariant-mass distribution to model the contribution from background processes, and a generic signal shape is used to determine the significance of observed deviations from this background estimate. No significant deviation is observed and upper limits are placed at the 95% confidence level on the fiducial cross-section times branching ratio for various resonance width hypotheses. The derived limits are shown to be applicable to spin-0, spin-1 and spin-2 signal hypotheses. For a set of benchmark models, the limits are converted into lower limits on the resonance mass and reach 4.5 TeV for the E6-motivated Z′ψ boson. Also presented are limits on Heavy Vector Triplet model couplings.
Original language | English |
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Pages (from-to) | 68-87 |
Journal | Physics Letters B |
Volume | 796 |
Early online date | 10 Jul 2019 |
DOIs | |
Publication status | Published - 10 Sept 2019 |
Bibliographical note
33 pages in total, author list starting page 17, 4 figures, 3 tables, submitted to PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-08ASJC Scopus subject areas
- Nuclear and High Energy Physics