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Search for Heavy Neutral Leptons in Decays of W Bosons Using a Dilepton Displaced Vertex in Formula Presented Collisions with the ATLAS Detector
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Search for Heavy Neutral Leptons in Decays of W Bosons Using a Dilepton Displaced Vertex in Formula Presented Collisions with the ATLAS Detector

E.K. Filmer, P. Jackson, A.X.Y. Kong, H. Potti, T.A. Ruggeri, A.S. Sharma, E.X.L. Ting, M.J. White, D.M. Gingrich, J.H. Lindon, …
Physical Review Letters, 卷.131(6), 061803
08/2023
DOI: https://doi.org/10.1103/PhysRevLett.131.061803

摘要

Physics and Astronomy (all)
A search for a long-lived, heavy neutral lepton ( N ) in 139 fb - 1 of s = 13 TeV p p 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.

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https://doi.org/10.1103/PhysRevLett.131.061803檢視
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