Search for Heavy Neutral Leptons in Decays of W Bosons Using a Dilepton Displaced Vertex in √s=13 TeV pp Collisions with the ATLAS Detector
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(Published version)
Date
2023
Authors
Aad, G.
Abbott, B.
Abbott, D.C.
Abed Abud, A.
Abeling, K.
Abhayasinghe, D.K.
Abidi, S.H.
Aboulhorma, A.
Abramowicz, H.
Abreu, H.
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Journal article
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Physical Review Letters, 2023; 131(6):061803-1-061803-23
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The Atlas Collaboration … G. Aad … E. K. Filmer … P. Jackson … A. X. Y. Kong … H. Potti … E. X. L. Ting … M. J. White … et al.
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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 → N μ or W → N e 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.
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© 2023 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3 .