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

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 m...

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Published in:	Physical review letters Vol. 131; no. 6
Main 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, Abulaiti, Y, Abusleme Hoffman, A.C, Acharya, B.S, Achkar, B, Adam, L, Adam Bourdarios, C, Adamczyk, L, Adamek, L, Addepalli, S.V, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, A.A, Afik, Y, Agaras, M.N, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, J.A, Ahmad, A, Ahmadov, F, Ahmed, W.S, Ai, X, Aielli, G, Aizenberg, I, Akbiyik, M, Åkesson, T.P.A, Akimov, A.V, Al Khoury, K, Alberghi, G.L, Albert, J, Albicocco, P, Alconada Verzini, M.J, Alderweireldt, S, Aleksa, M, Aleksandrov, I.N, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Allaire, C, Allbrooke, B.M.M, Allport, P.P, Aloisio, A, Alonso, F, Alpigiani, C, Alunno Camelia, E, Alvarez Estevez, M, Alviggi, M.G, Amaral Coutinho, Y, Ambler, A, Ambroz, L, Amelung, C, Amidei, D, Amor dos Santos, S.P, Amoroso, S, Amos, K.R, Amrouche, C.S, Ananiev, V, Anastopoulos, C, Andari, N, Andeen, T, Anders, J.K, Andrean, S.Y, Andreazza, A, Angelidakis, S, Angerami, A, Anisenkov, A.V, Annovi, A, Antel, C, Anthony, M.T, Antipov, E, Antonelli, M, Antrim, D.J.A, Anulli, F, Aoki, M, Aparisi Pozo, J.A, Aparo, M.A, Aperio Bella, L, Appelt, C, Aranzabal, N, Araujo Ferraz, V, Arcangeletti, C, Arce, A.T.H
Format:	Journal Article
Language:	English
Published:	American Physical Society 2023
Subjects:	High Energy Physics - Experiment Physics flavor: oscillation experimental results neutrino: flavor lepton: heavy CERN LHC Coll mass: hierarchy dilepton: final state ATLAS neutrino: mass W: leptonic decay neutrino: mixing background neutrino: left-handed track data analysis: vertex p p: scattering p p: colliding beams 13000 GeV-cms W: rare decay neutral particle: long-lived
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Summary:	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<m N <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.
ISSN:	0031-9007 1079-7114 1079-7114
DOI:	10.1103/PhysRevLett.131.061803