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

13000 GeV-cms QC770-798 W: leptonic decay Atomic 7. Clean energy 01 natural sciences 510 High Energy Physics - Experiment Subatomär fysik High Energy Physics - Experiment (hep-ex) Particle and Plasma Physics Hadron-Hadron scattering (experiments) Subatomic Physics [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] Collisions neutrino: mass info:eu-repo/classification/ddc/530 Mathematical Physics Quantum Physics proton–proton collisions scale: electroweak interaction ddc:530 Particle physics VDP::Kjerne- og elementærpartikkelfysikk: 431 Particle and High Energy Physics ATLAS Nuclear and Plasma Physics Nuclear & Particles Physics Settore FIS/01 - FISICA SPERIMENTALE :Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP] Nuclear and plasma physics transverse CERN LHC Coll Particle and high energy physics Mathematical physics neutrino: right-handed mass: Majorana Physical Sciences neutrino: Majorana vertex: primary signature asymmetry Materia oscura (astronomía) Bosone jets p p: scattering topology [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex] Regular Article - Experimental Physics VDP::Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 FOS: Physical sciences 530 dark matter dilepton Nuclear and particle physics. Atomic energy. Radioactivity 539 0103 physical sciences neutrino/mu Nuclear High Energy Physics High energy physics Neutrinos S077A00 S077A01 ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика VDP::Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431 hep-ex Matemática física y química :Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP] neutrino/e 500 Molecular Física neutrino: heavy Hadron-Hadron scattering Experimental High Energy Physics Hadron-hadron collisions neutrino: mixing p p: colliding beams experimental results
DOI: 10.1007/jhep10(2019)265 Publication Date: 2019-11-21T00:42:31Z
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ABSTRACT
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 fb −1 to 36.1 fb −1 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 4–300 mm from the interaction point. The search sets constraints on the HNL mixing to muon and electron neutrinos for HNL masses in the range 4.5–50 GeV.
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