Search for high-mass dilepton resonances using 139 fb⁻¹ of pp collision data collected at \sqrts=13 TeV with the ATLAS detector

Franconi, Laura; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Anders, John Kenneth; Beck, Hans Peter; Ereditato, Antonio; Weston, Thomas Daniel (2019). Search for high-mass dilepton resonances using 139 fb⁻¹ of pp collision data collected at \sqrts=13 TeV with the ATLAS detector. Physics letters. B, 796(68), pp. 68-87. Elsevier 10.1016/j.physletb.2019.07.016

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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 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 boson. Also presented are limits on Heavy Vector Triplet model couplings.

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