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Title: Search for new phenomena in three- or four-lepton events in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
Authors: Fiolhais, M. C. N. 
Gonçalo, R. 
Veloso, F. 
Wolters, H. 
ATLAS Collaboration
Keywords: High Energy Physics - Experiment; High Energy Physics - Experiment
Issue Date: 1-Jul-2021
Publisher: Elsevier B.V.
Serial title, monograph or event: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume: 824
Abstract: A search with minimal model dependence for physics beyond the Standard Model in events featuring three or four leptons ($3\ell$ and $4\ell$, $\ell = e,\mu$) is presented. The analysis aims to be sensitive to a wide range of potential new-physics theories simultaneously. This analysis uses data from $pp$ collisions delivered by the Large Hadron Collider at a centre-of-mass energy of $\sqrt{s} = 13$ TeV and recorded with the ATLAS detector, corresponding to the full Run 2 dataset of 139 fb$^{-1}$. The $3\ell$ and $4\ell$ phase space is divided into 22 event categories according to the number of leptons in the event, the missing transverse momentum, the invariant mass of the leptons, and the presence of leptons originating from a $Z$-boson candidate. These event categories are analysed independently for the presence of deviations from the Standard Model. No statistically significant deviations from the Standard Model predictions are observed. Upper limits for all signal regions are reported in terms of the visible cross-section.
Description: 40 pages in total, author list starting on page 25, 5 figures, 5 tables, published by Physics Letters B. All figures (including auxiliary figures) can be found at
ISSN: 03702693
DOI: 10.1016/j.physletb.2021.136832
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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