Jairo Alexis Rodriguez

First principles calculations of the ground state properties and structural phase transformation in YN

We have studied the structural and electronic properties of YN in rock salt (sodium chloride), caesium chloride, zinc blende and wurtzite structures using first-principles total energy calculations. Rock salt is the calculated ground state structure with a = 4.93 A, B0 = 157 GPa. The experimental lattice constant is a = 4.877 A. There is an additional local minimum in the wurtzite structure with total energy 0.28 eV/unit cell higher. At high pressure (~ 138 GPa), our calculations predict a phase transformation from a NaCl to a CsCl structure.

Different kind of textures of Yukawa coupling matrices in the two Higgs doublet model type III

The quark mass matrices ansätze proposed by Fritzsch, Du–Xing and Fukuyama–Nishiura in the framework of the general two Higgs doublet model are studied. The corresponding Yukawa matrices in the flavor basis in the various cases considered are discussed. The corresponding Cabibbo–Kobayashi–Maskawa matrix elements are computed in all cases and compared with their experimental values. The complex phases of the ansätze are taken into account, and the CP violating phase δ is computed. Finally, in order to observe the influence of the various kinds of texture of the Yukawa coupling matrices considered, some issues in the phenomenology of the two body decays of the top quark, the lightest Higgs boson and the charged Higgs boson are discussed.

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

We constrain some lepton flavor violating vertices in the context of the two Higgs doublet model type III, assuming that the lightest scalar Higgs mass mh0 is about 115 GeV. Specifically, based on the g 2 muon factor and the decay width of µ ! e, the following quite general bounds are obtained: 7.62 × 10 4 . � 2

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

Current experimental data from the

g-2

g-2

muon factor

muon factor, seems to show the necessity of physics beyond the Standard Model (SM), since the difference between SM and experimental predictions is 2.6

Upper bound of the lightest higgs boson in a supersymmetric SU(3)l x U(1)x gauge model

\sigma

Bounds on charged Higgs boson in the 2HDM type 3 from Tevatron

. In the framework of the General Two Higgs Doublet Model (2HDM), we calculate the muon anomalous magnetic moment to get lower and upper bounds for the Flavour Changing (FC) Yukawa couplings in the leptonic sector. We also obtain lower bounds for the mass of the pseudoscalar Higgs (

Constraint of the magnetic moment of the top quark from R(

m_{A^0}

b

) as a function of the parameters of the model.