108 citations · 533 across the 24 of their papers we have counts for
24 papers · 1 filter
Brazilian Report on Dark Matter 2024
I. F. M. Albuquerque, J. Alcaniz, A. Alves +51
One of the key scientific objectives for the next decade is to uncover the nature of dark matter (DM). We should continue prioritizing targets such as weakly-interacting massive pa…
A model for mixed warm and hot right-handed neutrino dark matter
Maíra Dutra, Vinícius Oliveira, C. A. de S. Pires +1
We discuss a model where a mixed warm and hot keV neutrino dark matter rises naturally. We arrange active and sterile neutrinos in the same multiplet, with the lightest s…
Vacuum stability and spontaneous violation of the lepton number at low energy scale in a model for light sterile neutrinos
João Paulo Pinheiro, C. A. de S. Pires
It is well known that the Standard Model of the Electroweak interactions rests on a metastable vacuum. This can only be fixed by means of new physics. Presently neutrino physics pr…
Brazilian Community Report on Dark Matter
E. Abdalla, I. F. M. Albuquerque, A. Alves +52
This white paper summarizes the activities of the Brazilian community concerning dark matter physics and highlights the importance of financial support to Brazilian groups that are…
A cosmologically viable eV sterile neutrino model
C. A. de S. Pires
The MiniBooNE collaboration recently released a report claiming have observed an excess of electron and anti-electron neutrino with significance of C.L. corroborating, i…
Implementing the inverse type-II seesaw mechanism into the 3-3-1 model
Carlos Antônio de Sousa Pires, Felipe Ferreira de Freitas, Jing Shu +2
After the LHC is turning on and accumulating more data, the TeV scale seesaw mechanisms for small neutrino masses in the form of inverse seesaw mechanisms are gaining more and more…
Neutrino masses, cosmological inflation and dark matter in a model with type II seesaw mechanism
J. G. Rodrigues, A. C. O. Santos, J. G. Ferreira +1
In this work we implement the type II seesaw mechanism into the framework of the gauge model. As main gain, the right-handed neutrinos of the model get free to play th…
Inflation scenario driven by a low energy physics inflaton
J. G. Ferreira, C. A. de S. Pires, J. G. Rodrigues +1
It is a longstanding desire of cosmologists, and particle physicists as well, to connect inflation to low energy physics, culminating, for instance, in what is known as Higgs infla…
Majorana Dark Matter in Minimal Higgs Portal Models after LUX
Maíra Dutra, C. A. de S. Pires, P. S. Rodrigues da Silva
We consider the Singlet Majorana fermion dark matter model, in which the standard model particles interact with the dark sector through the mixing of a singlet scalar and the Higgs…
On the connection of Gamma-rays, Dark Matter and Higgs searches at LHC
J. D. R. Alvares, C. A. de S. Pires, Farinaldo S. Queiroz +2
Motivated by the upcoming Higgs analyzes we investigate the importance of the complementarity of the Higgs boson chase on the low mass WIMP search in direct detection experiments a…
The seesaw mechanism at TeV scale in the 3-3-1 model with right-handed neutrinos
D. Cogollo, H. Diniz, C. A. de S. Pires +1
We implement the seesaw mechanism in the 3-3-1 model with right-handed neutrinos. This is accomplished by the introduction of a scalar sextet into the model and the spontaneous vio…
Fermion family number and the Z-Z mixing in the 3-3-1 model with right-handed neutrinos
D. Cogollo, H. Diniz, C. A. de S. Pires +1
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 su…
Invisible Z decay width bounds on active-sterile neutrino mixing in the (3+1) and (3+2) models
C. A. de S. Pires
In this work we consider the standard model extended with singlet sterile neutrinos with mass in the eV range and mixed with the active neutrinos. The active-sterile neutrino mixin…
Spontaneous CP violation in the 3-3-1 model with right-handed neutrinos
A. Doff, C. A. de S. Pires, P. S. Rodrigues da Silva
We implement the mechanism of spontaneous CP violation in the 3-3-1 model with right-handed neutrinos and recognize their sources of CP violation. Our main result is that the mecha…
Explicitly broken lepton number at low energy in the Higgs triplet model
C. A. de S. Pires
We suppose that lepton number is explicitly broken at low energy scale(M) in the framework of the Higgs triplet() model. The scalar sector of the model is developed considering…
Naturally light right-handed neutrinos in a 3-3-1 Model
Alex G. Dias, C. A. de S. Pires, P. S. Rodrigues da Silva
In this work we show that light right-handed neutrinos, with mass in the sub-eV scale, is a natural outcome in a 3-3-1 model. By considering effective dimension five operators, the…
Dynamically Induced Spontaneous Symmetry Breaking in 3-3-1 Models
Alex G. Dias, C. A. de S. Pires, V. Pleitez +1
We show that in SU(3)_C X SU(3)_L X U(1)_N (3-3-1) models embedded with a singlet scalar playing the role of the axion, after imposing scale invariance, dynamical symmetry breaking…
Neutrino Decay and Neutrinoless Double Beta Decay in a 3-3-1 Model
Alex G. Dias, A. Doff, C. A. de S. Pires +1
In this work we show that the implementation of spontaneous breaking of the lepton number in the 3-3-1 model with right-handed neutrinos gives rise to fast neutrino decay with majo…
More on deviation from bi-maximal neutrino mixing
C. A. de S. Pires
We study the case of presenting the exact bi-maximal mixing form with inducing the deviation from the bi-maximal mixing in the final form of the Pontecorvo-Maki-Nakag…
Discrete symmetries, invisible axion and lepton number symmetry in an economic 3-3-1 model
Alex G. Dias, C. A. de S. Pires, P. S. Rodrigues da Silva
We show that Peccei-Quinn and lepton number symmetries can be a natural outcome in a 3-3-1 model with right-handed neutrinos after imposing a Z_11 x Z_2 symmetry. This symmetry is…
Five-Dimensional QED, Muon Pair Production and Correction to the Coulomb Potential
J. R. Nascimento, C. A de S. Pires, R. F. Ribeiro
We consider QED in five dimensions in a configuration where matter is localized on a 3-brane while foton propagates in the bulk. The idea is to investigate the effects of the Kaluz…
Neutrino Mixing and the Minimal 3-3-1 Model
A. Gusso, C. A. de S. Pires, P. S. Rodrigues da Silva
In the minimal 3-3-1 model charged leptons come in a non-diagonal basis. Moreover the Yukawa interactions of the model lead to a non-hermitian charged lepton mass matrix. In other…
Ward identity in noncommutative QED
T. Mariz, C. A. de S. Pires, R. F. Ribeiro
Although noncommutative QED presents a nonabelian structure, it does not present structure constants. In view of this we investigate how Ward identity is satisfied in pair annihila…
Neutrinoless double beta decay with and without Majoron-like boson emission in a 3-3-1 model
J. C. Montero, C. A. de S. Pires, V. Pleitez
We consider the contributions to the neutrinoless double beta decays in a electroweak model. We show that for a range of the parameters in the model there a…