A search for a long-lived, heavy neutral lepton (N) in 139  fb^{-1} of sqrt[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<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.

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 / G. Aad, B.A.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 131:6(2023 Aug 07), pp. 061803.1-061803.23. [10.1103/PhysRevLett.131.061803]

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. Andreazza;A. Carbone;L. Carminati;S. D'Auria;L. Dell'Asta;M. Fanti;M. Lazzaroni;C. Meroni;L. Perini;F. Ragusa;A. Stabile;
2023

Abstract

A search for a long-lived, heavy neutral lepton (N) in 139  fb^{-1} of sqrt[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<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.
Settore ING-INF/07 - Misure Elettriche e Elettroniche
Settore FIS/01 - Fisica Sperimentale
7-ago-2023
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.061803
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1017868
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