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.| File | Dimensione | Formato | |
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