J.-Alexis Rodriguez

Lepton flavor violation in the two Higgs doublet model type III

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

Flavor-changing neutral currents and rare B decays in 3-3-1 models

\tan \beta \to \infty

Higgs boson decays in the littlest Higgs model

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

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

\tan \beta \to 0.

Lightest Higgs boson production at photon colliders in the two Higgs doublet model type III

Moreover, two of the four possible lagrangians correspond to the models of types I and II plus Flavor Changing (FC) interactions. The analitical expressions of the partial lepton number violating widths

Using the radiative decay

\Gamma (\mu \to eee)

b \to s \gamma

and

to bound the chromomagnetic dipole moment of the top quark

\Gamma (\mu \to e\gamma)

Higgs decay rate to two photons in a model with two fermiophobic-Higgs doublets

are derived for the cases (a) and (b) and both types of rotations.