Search for heavy Majorana neutrinos in same-sign dilepton channels in proton-proton collisions at √s=13 TeV

A search is performed for a heavy Majorana neutrino (N), produced in leptonic decay of a W boson propagator and decaying into a W boson and a lepton, with the CMS detector at the LHC. The signature used in this search consists of two same-sign leptons, in any flavor combination of electrons and muon...

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Detalhes bibliográficos
Autores: Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo Anoro, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R.
Tipo de documento: artigo
Data de publicação:2019
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/213150
Acesso em linha:http://hdl.handle.net/10261/213150
Access Level:Acceso aberto
Palavra-chave:Beyond Standard Model
Hadron-Hadron scattering (experiments)
ddc:530
Descrição
Resumo:A search is performed for a heavy Majorana neutrino (N), produced in leptonic decay of a W boson propagator and decaying into a W boson and a lepton, with the CMS detector at the LHC. The signature used in this search consists of two same-sign leptons, in any flavor combination of electrons and muons, and at least one jet. The data were collected during 2016 in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb. The results are found to be consistent with the expected standard model background. Upper limits are set in the mass range between 20 and 1600 GeV in the context of a Type-I seesaw mechanism, on |V|, |V|, and |VV |/(|V| + |V|), where V is the matrix element describing the mixing of N with the standard model neutrino of flavor ℓ = e, μ. For N masses between 20 and 1600 GeV, the upper limits on |V| range between 2.3 × 10 and unity. These are the most restrictive direct limits for heavy Majorana neutrino masses above 430 GeV.

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