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Article
Report number arXiv:1905.09787 ; CERN-EP-2019-071
Title Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt and displaced signatures with the ATLAS detector
Author(s) ATLAS Collaboration  Mostra tots els 2931 autors
Publication 2019-10-30
Imprint 23 May 2019
Number of pages 47
Note 44 pages in total, author list starting page 28, 6 figures, 6 tables. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2017-26/
In: JHEP 10 (2019) 265
DOI 10.1007/JHEP10(2019)265
Subject category Particle Physics - Experiment ; hep-ex
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords exotics ; rare decay ; experimental results
Abstract The problems of neutrino masses, matter-antimatter asymmetry, and dark matter could be successfully addressed by postulating right-handed neutrinos with Majorana masses below the electroweak scale. In this work, leptonic decays of W bosons extracted from 32.9 fb1 to 36.1 fb1 of 13 TeV proton-proton collisions at the LHC are used to search for heavy neutral leptons (HNLs) that are produced through mixing with muon or electron neutrinos. The search is conducted using the ATLAS detector in both prompt and displaced leptonic decay signatures. The prompt signature requires three leptons produced at the interaction point (either μμe or eeμ) with a veto on same-flavour opposite-charge topologies. The displaced signature comprises a prompt muon from the W boson decay and the requirement of a dilepton vertex (either μμ or μe) displaced in the transverse plane by 4300 mm from the interaction point. The search sets constraints on the HNL mixing to muon and electron neutrinos for HNL masses in the range 4.550 GeV.
Copyright/License preprint: © 2019-2025 CERN (License: CC-BY-4.0)
publication: © 2019-2025 CERN (License: CC-BY-4.0)



Corresponding record in: Inspire
Email contact: zhiqing.philippe.zhang@cern.ch


 Registre creat el 2019-05-23, darrera modificació el 2024-06-13


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