Rodolfo A. Diaz

SU(3)(c) x SU(3)(L) x U(1)(X) models for beta arbitrary and families with mirror fermions

A detailed and general study of the fermionic structure of the 331 models with {beta} arbitrary is carried out based on the criterion of cancellation of anomalies. We consider models with an arbitrary number of lepton and quark generations, but which require associating only one lepton and one quark SU(3){sub L} multiplet for each generation, and at most one right-handed singlet per each left-handed fermion. We see that the number of quark left-handed multiplets must be 3 times the number of leptonic left-handed multiplets. Furthermore, we consider a model with four families and {beta}=-1/{radical}(3) where the additional family corresponds to a mirror fermion of the third generation of the standard model. We also show how to generate ansatz about the mass matrices of the fermions according to the phenomenology. In particular, it is possible to get a natural fit for the neutrino hierarchical masses and mixing angles. Moreover, by means of the mixing between the third quark family and its mirror fermion, a possible solution for the A{sub FB}{sup b} discrepancy is obtained.A detailed and general study of the fermionic structure of the 331 models with \beta arbitrary is carried out based on the criterion of cancellation of anomalies. We consider models with an arbitrary number of lepton and quark generations, but requiring to associate only one lepton and one quark SU(3) _{L} multiplet for each generation, and at most one right-handed singlet per each left-handed fermion. We see that the number of quark left-handed multiplets must be three times the number of leptonic left-handed multiplets. Furthermore, we consider a model with four families and \beta =-1/\sqrt{3} where the additional family corresponds to a mirror fermion of the third generation of the Standard Model. We also show how to generate ansatzs about the mass matrices of the fermions according to the phenomenology. In particular, it is possible to get a natural fit for the neutrino hierarchical masses and mixing angles. Moreover, by means of the mixing between the third quark family and its mirror fermion, a possible solution for the A_{FB}^{b} discrepancy is obtained.

Scalar sector of the SU(3)c⊗SU(3)L⊗U(1)X model

A complete study of the Higgs sector of the

Lepton flavor violation in the two Higgs doublet model type III

SU(3)_{c}\otimes SU(3)_{L}\otimes U(1)_{X}

Phenomenology of lepton flavor violation in 2HDM(3) from (g-2)(mu) and leptonic decays

model is carried out, obtaining all possible cases of vacuum expectation values that permit the spontaneous symmetry breaking pattern

Bounds for lepton flavor violation and the pseudoscalar Higgs boson in the general two Higgs doublet model using the

SU(3)_{L}\otimes U(1)_{X}\to SU(2)_{L}\otimes U(1)_{Y}\to U(1)_{Q}.

g-2

We find the most general Higgs potentials that contain three triplets of Higgs and one sextet. A detailed study of the scalar sector for different models with three Higgs triplets is done. The models end up in an electroweak two Higgs doublet model after the first symmetry breakdown; we find that the low energy limit depends on a trilinear parameter of the Higgs potential, and that the decoupling limit from the electroweak two Higgs doublet model to the minimal standard model can be obtained quite naturally.

muon factor

We consider the Two Higgs Doublet Model (2HDM) of type III which leads to Flavour Changing Neutral Currents (FCNC) at tree level in the leptonic sector. In the framework of this model we can have, in principle, two situations: the case (a) when both doublets acquire a vacuum expectation value different from zero and the case (b) when only one of them is not zero. In addition, we show that we can make two types of rotations for the flavor mixing matrices which generates four types of lagrangians, with the rotation of type I we recover the case (b) from the case (a) in the limit

A new Supersymmetric SU(3)L ⊗ U(1)X gauge model

\tan \beta \to \infty

Flavor changing neutral currents from lepton and B decays in the two Higgs doublet model

, and with the rotation of type II we obtain the case (b) from (a) in the limit

Top squark searches at the Tevatron in models of low-energy supersymmetry breaking

\tan \beta \to 0.