Quebra espontanea da simetria leptônica no modelo 3-3-1 com neutrinos de mão direita

• Ano de defesa: 2009
• Autor(a) principal: Aponte, Diego Alejandro Cogollo
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraí­ba; BR; Programa de Pós-Graduação em Física; UFPB
• Palavras-chave em Português: Modelo 3-3-1RHV; Sexteto de escalares; Mecanismo See-Saw; Quebra espontânea da simetria leptônica; 3-3-1RHV model; See-Saw mechanism; Spontaneous breaking of the lepton number; Scalar sextet; CIENCIAS EXATAS E DA TERRA::FISICA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/tede/5771

The standard model does not predict mass for the neutrinos, and any evidence that neutrinos are massive particles is a signal of new physics. Recent experimental data on neutrino oscillations provide a convincing evidence that neutrinos are massive and very light particles, with mass in the scale of eVs. Thus, we must extend the standard model in order to incorporate mass terms for the neutrinos, and find a mechanism to explain the value of observed masses. It is almost a consensus that the See-Saw mechanism provides the most elegant explanation for the observed value of the masses of neutrinos. In this work we implement the See-Saw mechanism in the 3-3-1 model with right handed neutrinos. The implementation is made with the introduction of a scalar sextet and the spontaneous breaking of the lepton number. We identi fied the Majoron as a singlet by the group SU(2)LNU(1)y, which makes it safe under the current limits of the eletroweak data. The main result of this work is that the See-Saw mechanism works at the TeV scale, and as a result the mass of right handed neutrinos lies in the electroweak scale, providing a great opportunity to test their existence in the current detectors. Finally we present one of the most interesting properties of the model, the Flavour Changing Neutral Current (FCNC). We show the explicit form of this lagrangian and motivate the study of this phenomenon through Hadronic and leptonic interactions that enable their testability in the next generation of accelerators.