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Search for high-mass dilepton resonances using 139 fb(-1) of pp collision data collected at root s=13 TeV with the ATLAS detector
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 29252019 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 796, p. 68-87Article in journal (Refereed) Published
Abstract [en]

A search for high-mass dielectron and dimuon resonances in the mass range of 250 GeV to 6TeV is presented. The data were recorded by the ATLAS experiment in proton-proton collisions at a centre-ofmass energy of root 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 E-6-motivated Z(psi)' boson. Also presented are limits on Heavy Vector Triplet model couplings. 

Place, publisher, year, edition, pages
2019. Vol. 796, p. 68-87
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Physical Sciences
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URN: urn:nbn:se:su:diva-174924DOI: 10.1016/j.physletb.2019.07.016ISI: 000483426200013OAI: oai:DiVA.org:su-174924DiVA, id: diva2:1360680
Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-12-03Bibliographically approved

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Backman, FilipBohm, ChristianCarney, Rebecca M. D.Clément, ChristopheHellman, StenJon-And, KerstinKastanas, AlexandrosMilstead, David A.Moa, TorbjörnPasuwan, PatrawanShaikh, Nabila W.Silverstein, Samuel B.Sjölin, JörgenStrandberg, SaraUghetto, MichaëlValdes Santurio, EduardoWallängen, Veronica
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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