Analysis of the quark sector in the 2HDM-III with a four-zero Yukawa texture using the most recent data on the CKM matrix

In this letter we analyse, in the context of the general 2-Higgs Doublet Model, the structure of the Yukawa matrices, $\widetilde{ \bf Y}_{ _{1,2} }^{q}$, by assuming a four-zero texture ansatz for their definition. In this framework, we obtain compact expressions for $\widetilde{ \bf Y}_{ _{1,2} }^{q}$, which are reduced to the Cheng and Sher ansatz with the difference that they are obtained naturally as a direct consequence of the invariants of the fermion mass matrices. Furthermore, in order to avoid large flavour violating effects coming from charged Higgs exchange, we consider the main flavour constraints on the off-diagonal terms of Yukawa texture {{$\left( \widetilde{\chi}_{j}^q \right)_{kl}$}} ($k\neq l$). We perform a $\chi^2$-fit based on current experimental data on the quark masses and the Cabibbo-Kobayashi-Maskawa mixing matrix ${ \bf V}_{\rm CKM }$. Hence, we obtain the allowed ranges for the parameters $\widetilde{ \bf Y}_{ _{1,2} }^{q}$ at 1$\sigma$ for several values of $\tan \beta$. The results are in complete agreement with the bounds obtained taking into account constraints on Flavour Changing Neutral Currents reported in the literature.Comment: 12 pages, 1 figure. Version accepted in Phys. Lett.

Annihilation of Dipolar Dark Matter to Photons

In this work we study the annihilation of fermionic dark matter, considering it as a neutral particle with nonvanishing magnetic ($M$) and electric ($D$) dipole moments. Effective cross-section of the process $\chi \overline{\chi} \rightarrow \gamma \gamma$ is computed starting from a general form of coupling $\chi \overline{\chi} \gamma$ in the framework of an extension of the Standard Model. By taking into account annihilation of DM pairs into mono-energetic photons, we found that for small masses, $m_\chi \leq 10\,\textrm{GeV}$, an electric dipole moment $\sim 10^{-16}\, \textrm{e cm}$ is required to satisfy the current residual density inferences. Additionally, in order to pin down models viable to describe the physics of dark matter at the early Universe we also constrain our model according to recent measurements of the temperature anisotropies of the cosmic background radiation, we report constraints to the electric and magnetic dipole moments for a range of masses within our model.Comment: 20 pages, 6 figure

Charged Lepton Masses as a Possible CPV Source

We realize a model-independent study of the so-called Tri-Bi-Maximal pattern of leptonic flavor mixing. Different charged lepton mass matrix textures are studied. In particular, we are interested in those textures with a minimum number of parameters and that are able to reproduce the current experimental data on neutrino oscillation. The textures studied here form an equivalent class with two texture zeros. We obtain a Tri-Bi-Maximal pattern deviation in terms of the charged leptons masses, leading to a reactor angle and three CP violation phases non-zero. These lastest are one CP violation phase Dirac-like and two phases Majorana-like. Also, we can test the phenomenological implications of the numerical values obtained for the mixing angles and CP violation phases, on the neutrinoless double beta decay, and in the present and upcoming experiments on long-base neutrino oscillation, such as T2K, NOvA, and DUNE

Salicornia bigelovii (TORR.): UN SISTEMA MODELO PARA INCORPORARSE COMO CULTIVO AGRÍCOLA EN ZONAS ÁRIDO-DESÉRTICOS

Se define como reconversión de cultivos al cambio de producto o actividad que representa mayor rentabilidad económica y viabilidad social para el productor agrícola, al mismo tiempo que da un mejor uso del suelo, mejora la fertilidad del mismo y rompe con el ciclo biológico de plagas y enfermedades. En las zonas árido-desérticas, donde se produce el 70% de los alimentos agrícolas a nivel mundial, entre los factores adversos de tipo abiótico, se destaca el de la salinidad, el cual se agudiza conforme pasa el tiempo, mermando la producción de los cultivos convencionales. En este tipo de ambientes árido-salinos, las especies vegetales nativas son halotolerantes tolerando salinidades que varían de 2 a 55 g/L de agua. Algunas especies presentan tener una importancia agroindustrial como lo es la halófita Salicornia bigelovii, la cual puede ser utilizada para forraje, alimento humano, productos cosmetológicos, producción de biocombustibles, comprimidos a base de biomasa seca para la creación de escritorios, libreros, entre otros. La producción de Salicornia, demanda aguas salobres o agua de mar, la cual es un recurso que puede ser extraído de los litorales costeros o bien de tierras firmes continentales. El escalamiento de su producción depende de por tanto de la intensificación de nuestro conocimiento sobre diversos aspectos de su biología, fisiología, bioquímica e interacción con microorganismos benéficos que contribuyan a un mejor desarrollo y mejorada productividad de este recurso, sin alterar el medio ambient