Search for heavy neutral leptons in decays of W bosons using a dilepton displaced vertex in p √s = 13 TeV pp collisions with the ATLAS detector

ATLAS Collaboration

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29 Citations (Scopus)

Abstract

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 → Nμ 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.

Original languageEnglish
Article number061803
Pages (from-to)061803-1-061803-23
Number of pages23
JournalPhysical Review Letters
Volume131
Issue number6
DOIs
Publication statusPublished - 11 Aug 2023
Externally publishedYes

Bibliographical note

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