Mr
Reinier de Adelhart Toorop
(Nikhef Amsterdam)
07/12/2010, 17:00
T, C, P, CP symmetries, Accidental symmetries (B, L conservation)
We consider models of fermion masses and mixing, where the Standard Model is extended by the discrete family symmetry A4. In these models, the Standard Model Higgs field transforms as a triplet of the family symmetry group, giving quite an extended Higgs sector.
We consider two models that have been shown to explain the mass matrices in respectively the the quark sector and in the lepton...
Dr
Christoph Luhn
(University of Southampton)
07/12/2010, 17:25
T, C, P, CP symmetries, Accidental symmetries (B, L conservation)
Non-Abelian discrete family symmetries have been adopted in numerous models which try to explain the triplication of chiral families and describe the observed tri-bimaximal pattern of the leptonic mixing matrix. In my talk I motivate and discuss a possible gauge origin of such a discrete family symmetry. How does the remnant family symmetry arise in this scenario? What are the resulting...
Catarina Simoes
(Centro de Física Teórica de Partículas - Instituto Superior Técnico)
07/12/2010, 17:50
T, C, P, CP symmetries, Accidental symmetries (B, L conservation)
We show that Nearest-Neighbour Interaction (NNI) textures for the quark mass matrices can be
obtained through the introduction of an Abelian flavour symmetry. The minimal realisation re-
quires a Z4 symmetry in the context of a two Higgs doublet model. It is further shown that the
NNI textures can be in agreement with all present experimental data on quark masses and mixings, provided one...
Prof.
Alfonso Mondragon
(Institute of Physics/National Autonomous University of Mexico(UNAM))
07/12/2010, 18:15
T, C, P, CP symmetries, Accidental symmetries (B, L conservation)
By introducing three Higgs fields that are SU(2) doublets and a flavour permutational symetry, S_3, in the theory, we extend the concepts of flavour and generations to the Higgs sector and formulate a Minimal S_3-Invariant Extension of the Standard Model. The mass matrices of the neutrinos and charged leptons are reparametrized in terms of their eigenvalues, then the neutrino mixing matrix...