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

0578352 - FZÚ 2024 RIV US eng J - Journal Article
Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2854 authors
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.
Physical Review Letters. Roč. 131, č. 6 (2023), č. článku 061803. ISSN 0031-9007. E-ISSN 1079-7114
Research Infrastructure: CERN-CZ III - 90240
Institutional support: RVO:68378271
Keywords : ATLAS * lepton: heavy * W: leptonic decay * W: rare decay
OECD category: Particles and field physics
Impact factor: 8.6, year: 2022
Method of publishing: Open access

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.
Permanent Link: https://hdl.handle.net/11104/0347355