Search for heavy right-handed Majorana neutrinos in the decay of top quarks produced in proton-proton collisions at √𝑠 =13  TeV with the ATLAS detector

ATLAS Collaboration, S. Alderweireldt, J.F. Allen, T.M. Carter, P. J. Clark, J.R. Curran, D. Duda, S. M. Farrington, Y. Gao, J.M. Gargan, R.Y. Gonzalez Andana, C. Jiang, C. Leonidopoulos, M. Firdaus M. Soberi, V. J. Martin, L. Mijović, V.A. Parrish, E.A. Pender, T. Qiu, J.M. SilvaN. Themistokleous, E.M. Villhauer, B.M. Wynne, Z. Xu, E. Zaid

Research output: Contribution to journalArticlepeer-review

Abstract

A search for heavy right-handed Majorana neutrinos is performed with the ATLAS detector at the CERN Large Hadron Collider, using the 140  fb−1 of proton–proton collision data at √𝑠 =13  TeV collected during Run 2. This search targets 𝑡⁢¯𝑡
production, in which both top quarks decay into a bottom quark and a 𝑊 boson, where one of the 𝑊 bosons decays hadronically and the other decays into an electron or muon and a heavy neutral lepton. The heavy neutral lepton is identified through a decay into an electron or muon and another 𝑊 boson, resulting in a pair of same-charge same-flavor leptons in the final state. This paper presents the first search for heavy neutral leptons in the mass range of 15–75 GeV using 𝑡⁢¯𝑡 events. No significant excess is observed over the background expectation, and upper limits are placed on the signal cross sections. Assuming a benchmark scenario of the phenomenological type-I seesaw model, these cross section limits are then translated into upper limits on the mixing parameters of the heavy Majorana neutrino with Standard Model neutrinos
Original languageEnglish
Article number112004
Pages (from-to)1-33
Number of pages33
JournalPhysical Review D
Volume110
Issue number11
Early online date1 Dec 2024
DOIs
Publication statusPublished - 2 Dec 2024

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