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
Year: 2024
Type: article
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 tt¯ 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 tt¯ 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.
Authors: Ali, Hanadi, Alsolami, Zainab, Barton, A.E., Borissov, G., Bouhova-Thacker, E.V., Ferguson, R.A.M., Ferrando, James, Fox, H., Hagan, Alina, Henderson, R.C.W., Jones, R.W.L., Kartvelishvili, V., Love, P.A., Marshall, E.J., Meng, L., Muenstermann, D., Ribaric, N., Sampson, Elliot, Smizanska, M., Spinali, S., Wharton, A.M.
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7052591087
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