Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/1976
Título: Spontaneous leptonic CP violation and nonzero theta(13)
Autor: Branco, G. C.
Gonzalez Felipe, R.
Joaquim, F. R.
Serôdio, H.
Palavras-chave: Double-Beta Decay
Discrete Flavor Symmetries
Neutrino Masses
Particle Physics
Triplet Seesaw
Data: 8-Out-2012
Editora: Amer Physical Soc
Citação: Branco G C, Gonzalez F R, Joaquim F R, Serôdio H. Spontaneous leptonic CP violation and nonzero theta(13). Physical Review D. 2012; 7 (86).
Relatório da Série N.º: ;076008
Resumo: We consider a simple extension of the Standard Model by adding two Higgs triplets and a complex scalar singlet to its particle content. In this framework, the CP symmetry is spontaneously broken at high energies by the complex vacuum expectation value of the scalar singlet. Such a breaking leads to leptonic CP violation at low energies. The model also exhibits an A(4) X Z(4) flavor symmetry which, after being spontaneously broken at a high-energy scale, yields a tribimaximal pattern in the lepton sector. We consider small perturbations around the tribimaximal vacuum alignment condition in order to generate nonzero values of theta(13), as required by the latest neutrino oscillation data. It is shown that the value of theta(13) recently measured by the Daya Bay Reactor Neutrino Experiment can be accommodated in our framework together with large Dirac-type CP violation. We also address the viability of leptogenesis in our model through the out-of-equilibrium decays of the Higgs triplets. In particular, the CP asymmetries in the triplet decays into two leptons are computed and it is shown that the effective leptogenesis and low-energy CP-violating phases are directly linked.
Peer review: yes
URI: http://hdl.handle.net/10400.21/1976
ISSN: 1550-7998
Aparece nas colecções:ISEL - Física - Artigos

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