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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10494324" target="_blank" >RIV/00216208:11320/24:10494324 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=S6v2F-EHLf" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=S6v2F-EHLf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.110.112004" target="_blank" >10.1103/PhysRevD.110.112004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 SQUARE ROOTs = 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 SQUARE ROOTs = 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review D

ISSN

2470-0010

e-ISSN

2470-0029

Svazek periodika

110

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

33

Strana od-do

112004

Kód UT WoS článku

001381817100003

EID výsledku v databázi Scopus

2-s2.0-85213044235