Triple seesaw mechanism

On fitting the type II seesaw mechanism into the type I seesaw mechanism, we obtain a formula to the neutrino masses which get suppressed by high-scale $M^3$ in its denominator. As a result, light neutrinos are naturally obtained with new physics at TeV scale. As interesting consequence, the mechanism may be directly probed at the LHC by directly producing the TeV states intrinsic of the mechanism. We show that the 3-3-1 model with right-handed neutrinos realizes naturally such seesaw mechanism.Comment: About 13 pages, no figure

O mercado de crédito de carbono e as possibilidades da obtenção de biodiesel a partir de óleos vegetais.

bitstream/item/108088/1/2009-DOC-0104.pd

Explaining ATLAS and CMS Results Within the Reduced Minimal 3-3-1 model

Recently the ATLAS and CMS collaborations announced the discovery of a higgs particle with a mass of $\sim 125$ GeV. The results are mildly consistent with the Standard Model Higgs boson. However, the combined data from these collaborations seem to point to an excess in the $h \rightarrow \gamma \gamma$ channel. In this work we analyze under which conditions this excess may be plausibly explained within the reduced minimal 3-3-1 model, while being consistent with bb, WW, ZZ and $\tau^+\tau^-$ channels. Moreover, we derive the properties of the heavy neutral and the doubly charged scalars predicted by the model. We then conclude that at a scale of a few TeV, this model provides a good fit to the ATLAS and CMS signal strength measurements, and therefore stands as an appealing alternative to the standard model.Comment: 23 pages, 9 figures. References adde

Combining type I and type II seesaw mechanisms in the minimal 3-3-1 model

The minimal 3-3-1 model is perturbative until energies around 4-5TeV, posing a challenge to generate neutrino masses at eV scale, mainly if one aims to take advantage of the seesaw mechanism. As a means to circumvent this problem we propose a modification of the model such that it accommodates the type I and type II seesaw mechanisms altogether. We show that the conjunction of both mechanisms yield a neutrino mass expression suppressed by a high power of the cutoff scale, $M^5$, in its denominator. With such a suppression term we naturally obtain neutrino masses at eV scale when $M$ is around few TeV. We also investigate the size of lepton flavor violation through the process $\mu \rightarrow e\gamma$.Comment: about 15 pages, no figure

Novel sources of Flavor Changed Neutral Currents in the 331RHN331_{RHN} model

Sources of Flavor Changed Neutral Currents (FCNC) naturally emerge from a well motivated framework called 3-3-1 with right-handed neutrinos model, $331_{RHN}$ for short, mediated by an extra neutral gauge boson $Z^{\prime}$. Following previous works we calculate these sources and in addition we derive new ones coming from CP-even and -odd neutral scalars which appear due to their non-diagonal interactions with the physical standard quarks. Furthermore we show that bounds related to the neutral mesons systems $K_L-K_S$ and $D_1^0 - D_2^0$ may be significantly strengthened in the presence of these new interactions allowing us to infer stronger constraints on the parameter space of the model.Comment: Published version. 10 pages, 6 figure

Deep learnig analysis of the inverse seesaw in a 3-3-1 model at the LHC

Inverse seesaw is a genuine TeV scale seesaw mechanism. In it active neutrinos with masses at eV scale requires lepton number be explicitly violated at keV scale and the existence of new physics, in the form of heavy neutrinos, at TeV scale. Therefore it is a phenomenologically viable seesaw mechanism since its signature may be probed at the LHC. Moreover it is successfully embedded into gauge extensions of the standard model as the 3-3-1 model with the right-handed neutrinos. In this work we revisit the implementation of this mechanism into the 3-3-1 model and employ deep learning analysis to probe such setting at the LHC and, as main result, we have that if its signature is not detected in the next LHC running with energy of 14 TeVs, then, the vector boson $Z^{\prime}$ of the 3-3-1 model must be heavier than 4 TeVs

Fermion family number and the Z-Z′^{\prime} mixing in the 3-3-1 model with right-handed neutrinos

Theoretical consistency of the 3-3-1 model with right-handed neutrinos demands that the number of family of fermions be exactly equal to three. In this brief report we show that such theoretical requirement results in a clean and severe bound on the Z-Z$^{\prime}$ mixing angle: -3,979\times 10^{-3}<\phi<1,309\times 10^{-4} {with 90% CL}.Comment: Minor modification in the conclusions, some refs added, to appear at MPL

No gaussianidad y correcciones de lazo en un modelo inflacionario de rodadura lenta con potencial escalar cuadrático de dos componentes. Parte II

We calculate the trispectrum Tζ(k1, k2, k3, k4) of the curvature&nbsp;perturbation ζ, generated during an inflationary slow-roll epoch and considering a two-component quadratic scalar potential. At calculating we&nbsp;consider tree-level and one-loop contributions, showing that it is possible&nbsp;to obtain an observable value for the non-gaussianity level τNL if Tζ is&nbsp;dominated by the one-loop contribution. The work is developed taking into account that there exist some physical restrictions that reduce the available parameter window. Such conditions are: the existence of a coupling constant that guarantees making the calculation in a perturbative regime, the relative weight of the tree-level and one-loop contributions, the spectrum normalisation, the observed spectral index, and the minimum amount of inflation required to solve the horizon problem.Se calcula el triespectro Tζ(k1,k2,k3,k4) de la perturbación en&nbsp;la curvatura ζ, generado durante una época inflacionaria de rodadura lenta&nbsp;y considerando un potencial escalar cuadrático de dos componentes. En el&nbsp;cálculo se consideran contribuciones a nivel árbol y a un lazo, y se muestra&nbsp;que es posible obtener un valor observable para el nivel de no gaussianidad&nbsp;τNL si Tζ es dominado por la contribución a un lazo. El trabajo se desarrolla&nbsp;teniendo en cuenta que existen algunas restricciones físicas que reducen la&nbsp;ventana de parámetros disponible. Estas condiciones son: la existencia de&nbsp;una constante de acoplamiento que garantiza la realización del cálculo en&nbsp;un régimen perturbativo, el peso relativo de las contribuciones a nivel árbol&nbsp;y a un lazo, la normalización del espectro, el índice espectral observado y el&nbsp;monto de inflación mínimo necesario para resolver el problema de horizonte

No gaussianidad y correcciones de lazo en un modelo inflacionario de rodadura lenta con potencial escalar cuadrático de dos componentes. Parte II

Se calcula el triespectro Tζ(k1,k2,k3,k4) de la perturbación en la curvatura ζ, generado durante una época inflacionaria de rodadura lenta y considerando un potencial escalar cuadrático de dos componentes. En el cálculo se consideran contribuciones a nivel árbol y a un lazo, y se muestra que es posible obtener un valor observable para el nivel de no gaussianidad τNL si Tζ es dominado por la contribución a un lazo. El trabajo se desarrolla teniendo en cuenta que existen algunas restricciones físicas que reducen la ventana de parámetros disponible. Estas condiciones son: la existencia de una constante de acoplamiento que garantiza la realización del cálculo en un régimen perturbativo, el peso relativo de las contribuciones a nivel árbol y a un lazo, la normalización del espectro, el índice espectral observado y el monto de inflación mínimo necesario para resolver el problema de horizonte