arXiv subjects

J-Alexis Rodriguez

Publications and source records attributed to J-Alexis Rodriguez.

7 recordsLinked to original sources

arXiv2011

Sources of FCNC in $SU(3)_C \otimes SU(3)_L \otimes U(1)_X$ models

There are different models based on the gauge symmetry $SU(3)_C \otimes SU(3)_L \otimes U(1)_X$ (331) some of them includes exotic particles and others are constructed without any exotic charges assigned to the fermionic spectrum. Each model build up on 331 symmetry has its own interesting properties according to the representations of the gauge group used for the fermionic spectrum; that is the main reason to explore and identify the possible sources of flavor changing neutral currents and lepton flavor violation at tree level.

hep-ph↗

arXiv2006

Oscillations bounded by the simple pendulum and the oscillating rigid rod

The oscillation periods bounded by a simple pendulum and an oscillating rigid rod are illustrated using a multiple pendulum. Oscillation periods between these two limits are obtained. A theoretical approach using the Lagrangian formalism and the set up of three simple experiments are presented in order to probe our approach.

physics.ed-ph↗

arXiv2006

B -> X_s γand B^+ -> l^+ νin the 2HDM 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 framework of this model we calculate the NLO contribution for b->s γand the branchings for the meson decays B^+ -> l^+ ν. We examine the limits on the new parameters λ_{bb} and M_{H^\pm}. We take into account the relationship between λ_{tt} and λ_{bb} coming from the validness of perturbation theory.

hep-ph↗

arXiv2002

The Anomalous Chromomagnetic Dipole Moment of the Top Quark in Different Frameworks

We give explicit formulae for the anomalous chromomagnetic dipole moment of the top quark in the framework of the standard model, the two higgs doublet model and the minimal supersymmetric standard model. Finally, we compare the results for this coupling with the bound -0.03 <= Delta kappa <= 0.01 coming from analysis of b --> s gamma process whith an on-shell gluon.

hep-ph↗

arXiv2001

The anomalous chromomagnetic dipole moment of the top quark in the standard model and beyond

The anomalous chromomagnetic moment of the top quark arises from one loop corrections to the vertex $\bar t t g$. We give explicit formulae for this anomalous coupling in the framework of the standard model, the two Higgs doublet model and the minimal supersymmetric standard model. We compare the results for the anomalous coupling with the bound $-0.03 \leq \Delta \kappa \leq 0.01$ emerging from the analysis of $b \to s \gamma$ process with an on-shell bremsstrahlung gluon. This enables us to study the allowed region of parameters of the models under consideration.

hep-ph↗

arXiv2001

The rare decay $t \to c γ$ in the General 2HDM type III

We consider the branching ratio for the process $t \to c γ$ in the context of the General Two Higgs Doublet Model type III. We find that taking into account reasonable values for the parameter $\tan β$ is possible to get values of this branching ratio up to orders of magnitude lying in the range of sensitivity of near future top quark experiments. For values of $B(t \to c γ) \sim 1-9 \times 10^{-5}$, values between 8-15 for $\tan β$ are allowed.

hep-ph↗

arXiv1999

Getting bounds on the mixing angles for a non-sequential bottom quark

We analyze the vertex Zff in the framework of models that add a new bottom quark in a nonsequential way and we evaluate the tree level contribution to LEP/SLC data $R_{b}$, $R_{l}$ and the total Z width $\Gamma_{Z}$. We obtain bounds for the mixing angles through the experimentally allowed contour regions of the parameters $\Lambda_{L,R}$ introduced here. In order to get a more restrictive region, we also consider the experimental results for $B\to \nu \nu X$ as well.

hep-ph↗