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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

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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...

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Main Authors: Aad, Georges (Author) , Ackermann, Anke (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Rio, Fernando del (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Mkrtchyan, Tigran (Author) , Ott, Philipp (Author) , Rassloff, Damir Fabrice (Author) , Sanfilippo, Lorenzo (Author) , Sauer, Christof (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Vigani, Luigi (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 2 December 2024
In: Physical review
Year: 2024, Volume: 110, Issue: 11, Pages: 1-33
ISSN:2470-0029
DOI:10.1103/PhysRevD.110.112004
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevD.110.112004
Verlag, kostenfrei, Volltext: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.110.112004
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Author Notes:G. Aad et al., (ATLAS Collaboration)
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Summary: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.
Item Description:ATLAS Collaboration: G. Aad, A. Ackermann, L.M. Baltes, F. Bartels, F. Del Rio, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, P.S. Ott, D.F. Rassloff, L. Sanfilippo, C. Sauer, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, P. Starovoitov, L. Vigani, S. M. Weber, M. Wessels, J. Zinsser [und 2909 weitere]
Gesehen am 03.07.2025
Physical Description:Online Resource
ISSN:2470-0029
DOI:10.1103/PhysRevD.110.112004

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