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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F24%3A00381009" target="_blank" >RIV/68407700:21220/24:00381009 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21240/24:00381009 RIV/68407700:21340/24:00381009 RIV/68407700:21670/24:00381009
Result on the web
<a href="https://doi.org/10.1103/PhysRevD.110.112004" target="_blank" >https://doi.org/10.1103/PhysRevD.110.112004</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.110.112004" target="_blank" >10.1103/PhysRevD.110.112004</a>

Result language
angličtina
Original language name
Search for heavy right-handed Majorana neutrinos in the decay of top quarks produced in proton-proton collisions at root s=13 TeV with the ATLAS detector
Original language description
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 root s = 13 TeV collected during Run 2. This search targets t (t) over bar 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) over bar 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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics

Project
<a href="/en/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Fundamental constituents of matter through frontier technologies</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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