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Master's Dissertation
DOI
10.11606/D.43.2012.tde-26032013-145746
Document
Author
Full name
Lindber Ivan Salas Escobar
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Burdman, Gustavo Alberto (President)
Mizukoshi, José Kenichi
Nielsen, Marina
Title in Portuguese
Modelos seesaw a baixas energias e modelo de violação mínima de sabor no modelo seesaw tipo III
Keywords in Portuguese
modelo padrão
modelos seesaw
violação de sabor leptônico
Abstract in Portuguese
Enquanto todos os modelos com neutrinos massivos de Majorana levam ao mesmo operador efetivo de dimensão d = 5, que não conserva número leptônico, os operadores de dimensão d = 6, obtidos a baixas energias, conservam número leptônico e são diferentes dependendo do modelo de alta energia da nova física. Derivamos os operadores de dimensão d = 6 que são característicos de modelos Seesaw genéricos, no qual a massa do neutrino resulta do intercâmbio de campos pesados que podem ser tanto singletos fermiônicos, tripletos fermiônicos ou tripletos escalares. Os operadores resultantes podem conduzir a efeitos observáveis no futuro próximo, se os coeficientes dos operadores de dimensão d = 5 e d = 6 são desacoplados. Neste trabalho apresentamos o modelo violação mínima de sabor no contexto do modelo seesaw tipo III, no qual é possível obter tal desacoplamento. Isto permite reconstruir a estrutura de sabor a partir dos valores das massas dos neutrino leves e dos parâmetros de mistura, mesmo na presença de fases de violação CP.
Title in English
Low energy of seesaw models and minimal flavour violation in type III seesaw
Keywords in English
lepton flavor violation
seesaw models
standard model
Abstract in English
While all models of Majorana neutrino masses lead to the same dimension five effective operator, which does not conserve lepton number, the dimension six operators induced at low energies conserve lepton number and differ depending on the high energy model of new physics. We derive the low-energy dimension six operators which are characteristic of generic Seesaw models, in which neutrino masses result from the exchange of heavy fields which may be either fermionic singlets, fermionic triplets or scalar triplets. The resulting operators may lead to effects observable in the near future, if the coefficients of the dimension five and six operators are decoupled. In this work we present the model of minimal avor violation in the context of the type III seesaw model, in which it is possible to obtain the decoupling mentioned before. This allows to reconstruct the avour structure of the model from the values of the light neutrino masses and mixing parameters, even in the presence of CP-violating phases.
 
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Publishing Date
2013-05-23
 
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