Abstract
A search for a long-lived, heavy neutral lepton (N) in 139 fb−1 of √s = 13 TeV pp collision data collected by the ATLAS detector at the Large Hadron Collider is reported. The N is produced via W→Nμ or W→Ne and decays into two charged leptons and a neutrino, forming a displaced vertex. The N mass is used to discriminate between signal and background. No signal is observed, and limits are set on the squared mixing parameters of the N with the left-handed neutrino states for the N mass range 3 GeV <mN<15 GeV. For the first time, limits are given for both single-flavor and multiflavor mixing scenarios motivated by neutrino flavor oscillation results for both the normal and inverted neutrino-mass hierarchies.
Original language | English |
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Article number | 061803 |
Number of pages | 23 |
Journal | Physical Review Letters |
Volume | 131 |
DOIs | |
Publication status | Published - 7 Aug 2023 |
Bibliographical note
Not yet published as of 13/07/2023.21 pages in total 14 figures, 1 tables, submitted to Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2019-29/
Keywords
- hep-ex