Teorias efetivas e violação de sabor leptônico em decaimentos do Higgs

• Ano de defesa: 2015
• Autor(a) principal: Prado, Leônidas Augusto Fernandes do [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Higgs bosons; Higgs, Bosons de; Violação de CP (Física nuclear)
• Link de acesso: http://hdl.handle.net/11449/154697; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/01-11-2017/000866736.pdf

We consider the Higgs Lepton Flavor Violating decay h→ 'tau' 'mü' in the framework of effective theories, on which CMS reported a 2.5 σ excess of events. The operator that is responsible for this process, however, is in many models correlated to dipole operators that are already under stringent experimental constraints. We then explore in which cases it is possible to obtain a flavor violating operator that is big enough to be seen in Higgs decays at the LHC, while still respecting the leptonic radiative decay bounds. We also present two models, a simplified Composite Higgs model and a Higgs Portal model, showing how the process h→ 'tau' 'mü' is generated in each of them. We find that if the CMS signal is confirmed, the second model is favored, while it is unlikely that the first model will be able to explain it