Search for heavy Majorana neutrinos with the ATLAS detector in pp collisions at s√=8 TeV
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Aad, G., Abbott, B., Abdallah, J. et al. Search for heavy Majorana neutrinos with the ATLAS detector in pp collisions at s√=8 TeV. J. High Energ. Phys. 2015, 162 (2015). [https://doi.org/10.1007/JHEP07(2015)162]
SponsorshipANPCyT; YerPhI, Armenia; Australian Research Council; BMWFW, Austria; Austrian Science Fund (FWF); Azerbaijan National Academy of Sciences (ANAS); SSTC, Belarus; National Council for Scientific and Technological Development (CNPq); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); Natural Sciences and Engineering Research Council of Canada; NRC, Canada; Canada Foundation for Innovation; CERN; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); Chinese Academy of Sciences; Ministry of Science and Technology, China; National Natural Science Foundation of China; Departamento Administrativo de Ciencia, Tecnologia e Innovacion Colciencias; Ministry of Education, Youth & Sports - Czech Republic Czech Republic Government; DNRF, Denmark; Danish Natural Science Research Council; Lundbeckfonden; European Union (EU); European Union (EU) European Research Council (ERC); Centre National de la Recherche Scientifique (CNRS); CEA-DSM/IRFU, France; GNSF, Georgia; Federal Ministry of Education & Research (BMBF); German Research Foundation (DFG); HGF, Germany; Max Planck Society; Alexander von Humboldt Foundation; Greek Ministry of Development-GSRT; NSRF, Greece; Hong Kong Research Grants Council; Israel Science Foundation; MINERVA, Israel; German-Israeli Foundation for Scientific Research and Development; I-CORE, Israel; Benoziyo Center, Israel; Istituto Nazionale di Fisica Nucleare (INFN); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science; CNRST, Morocco; FOM (The Netherlands) Netherlands Government; Netherlands Organization for Scientific Research (NWO) Netherlands Government; BRF, Norway; RCN, Norway; Ministry of Science and Higher Education, Poland; NCN, Poland; GRICES, Portugal; Portuguese Foundation for Science and Technology; MNE/IFA, Romania; Russian Federation; NRC KI, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; MIZS, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC, Sweden; Wallenberg Foundation, Sweden; SER, Switzerland; Swiss National Science Foundation (SNSF); Cantons of Bern and Geneva, Switzerland; National Science Council of Taiwan; Ministry of Energy & Natural Resources - Turkey; Royal Society of London; Leverhulme Trust; United States Department of Energy (DOE); National Science Foundation (NSF); ICREA; Science & Technology Facilities Council (STFC) ST/H001093/2 ST/L001195/1 ST/M002306/1 ATLAS Upgrades ST/M002071/1 ATLAS Upgrades ST/K003658/1 GRIDPP ST/J005576/1 1366364 ST/K001361/1 ST/G50228X/1 1082012 ST/M004821/1 ST/L003414/1 ST/L001209/1 ATLAS Upgrades ST/L001144/1 ST/L000970/1 ATLAS Upgrades ST/K00137X/1 ST/K001248/1 ST/I00372X/1 GRIDPP ST/I005803/1 ST/J004928/1 ST/M001407/1 PP/E000355/1 ST/K001310/1 ATLAS ST/K001361/1 LHCb ST/K001426/1 ATLAS ST/M000761/1 ST/L003325/1 ST/K001310/1 LHCb ST/K001264/1 ATLAS ST/J00474X/1 ATLAS Upgrades ST/I005803/1 GRIDPP ST/L001179/1 ATLAS Upgrades ST/L000970/1 ATLAS Upgrade ST/K001361/1 ATLAS ST/J00474X/1 ST/I00372X/1 1366825 ST/M004821/1 GRIDPP ST/L000970/1 ST/K00140X/1 ST/K001329/1 PP/E002846/1 PP/E000347/1 GRIDPP ST/M001733/1 ST/M001504/1 ST/K003658/1 ST/I006080/1 ST/H00100X/1 ST/N000463/1 ST/M001474/1 ST/L000326/1 ST/K001418/1 ST/J004944/1 ATLAS 1334588 PP/D002915/1 ST/I006056/1 ATLAS Upgrades PP/E003087/1 ST/M006980/1 ST/M003213/1 ST/M002306/1 ST/M001431/1 ST/L006480/1 ST/L00352X/1 ST/I000186/1 ST/L003112/1 ST/K000705/1 ST/J004928/1 ATLAS Upgrades ST/K001310/1 ST/J004928/1 ATLAS Upgrade PP/E000444/1 ST/K001310/1 ATLAS Upgrades ST/K001310/1 LHCb Upgrades ST/K001361/1 ATLAS Upgrades ST/K001361/1 MINOS/MINOS+ ST/N000307/1 ST/J005525/1 ST/H001093/1 ST/G502320/1 ST/I006056/1 ATLAS Upgrade ST/L001179/1 ATLAS Upgrade ST/L001179/1 ST/I006056/1 1575161 ST/K001302/1 ST/K00073X/1 ST/I000178/1 1521422 ST/K001361/1 LHCb Upgrades ST/J005487/1 1201187 ST/H00100X/2 ST/M006980/1 ATLAS Upgrades ST/M007103/1 ATLAS Upgrades
A search for heavy Majorana neutrinos in events containing a pair of high-pT leptons of the same charge and high-pT jets is presented. The search uses 20.3 fb−1 of pp collision data collected with the ATLAS detector at the CERN Large Hadron Collider with a centre-of-mass energy of s√=8 TeV. The data are found to be consistent with the background-only hypothesis based on the Standard Model expectation. In the context of a Type-I seesaw mechanism, limits are set on the production cross-section times branching ratio for production of heavy Majorana neutrinos in the mass range between 100 and 500 GeV. The limits are subsequently interpreted as limits on the mixing between the heavy Majorana neutrinos and the Standard Model neutrinos. In the context of a left-right symmetric model, limits on the production cross-section times branching ratio are set with respect to the masses of heavy Majorana neutrinos and heavy gauge bosons WR and Z′.