A5012418676- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Galaxies: Formation, Evolution, Phenomena
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Noncommutative and Quantum Gravity Theories
- Particle accelerators and beam dynamics
- Digital Image Processing Techniques
- Health, Environment, Cognitive Aging
- Advanced Banach Space Theory
- Computational Geometry and Mesh Generation
- Financial Distress and Bankruptcy Prediction
- Geophysics and Gravity Measurements
- Advanced NMR Techniques and Applications
- Taxation and Compliance Studies
- Radio Astronomy Observations and Technology
- Muon and positron interactions and applications
Universidade Federal da Paraíba
2015-2024
Universidade Federal de Santa Catarina
2024
Universidade Federal do Rio Grande do Norte
2022
Universidad Andrés Bello
2022
Yamagata University
2021
Institute of Theoretical Physics
2018
Chinese Academy of Sciences
2018
Technical University of Munich
2015
Universidade Federal do Pará
2015
European Organization for Nuclear Research
2015
We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, particle physics in each case viewed both theoretical experimental/observational perspectives. After reviewing the role active neutrinos physics, we focus on context Matter puzzle. Here, first motivation for based challenges tensions purely cold scenarios. then round out discussion by critically summarizing known...
In this work we show that from the spectrum of particles a 3-3-1 gauge model with heavy sterile neutrinos can have up to three Cold Dark Matter candidates as WIMPs. We obtain their relic abundance and analyze compatibility recent direct detection experiments, exploring possibility explaining two events reported by CDMS-II. An interesting outcome model, concerning WIMPs in is strong bound on symmetry breaking scale, which imposes it be above 3 TeV.
Motivated by the upcoming Higgs analyzes we investigate importance of complementarity boson chase on low mass WIMP search in direct detection experiments and gamma-ray emission from Galactic Center measured Fermi-LAT telescope context $SU(3)_c\otimes SU(3)_L\otimes U(1)_N$. We obtain relic abundance, thermal cross section, WIMP-nucleon section regime network them with branching ratios model. conclude that has a profound connection to dark matter problem our model, particular for case...
Differently from the canonical seesaw mechanism, which is grounded in grand unified theories, inverse mechanism lacks a special framework that realizes it naturally. In this work we advocate 3-3-1 model with right-handed neutrinos has such an appropriate to accommodate mechanism. We also discuss smallness of lepton number violating mass and estimate branching ratio for rare flavor violation process $\ensuremath{\mu}\ensuremath{\rightarrow}e\ensuremath{\gamma}$.
In the context of standard model quantization electric charge occurs only family by family. When we consider three families together with massless neutrinos is not quantized any more. Here show that a chiral bilepton gauge based on group SU(3)_C X SU(3)_L U(1)_N explains when take into account fermions. This result does depend neutrino masses. Charge either are or Dirac Majorana massive fields.
We investigate the Higgs boson production through gluon fusion and its decay into two photons at LHC in context of minimal 3-3-1 model alternative version with exotic leptons. The diphoton channel presents an enhanced signal this compared to standard due presence extra singly charged vector a doubly one. Prospects for detection 7 TeV center-of-mass energy up $10\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ are presented. Our results suggest that from these models can potentially explain...
Recent observations suggest that the number of relativistic degrees freedom in early universe might exceed what is predicted standard cosmological model. If even a small, percent-level fraction dark matter particles are produced relativistically, they could mimic effect an extra realistic species at matter–radiation equality while obeying BBN, CMB and Structure Formation bounds. We show this scenario quite naturally realized with weak-scale particle high-scale "mother" within well-motivated...
The type II seesaw is a popular mechanism for generating Majorana neutrino masses at the right scale, with well-known implications Lepton Flavor Violation. In non-abelian extension of Standard Model featuring Z' field, type-II Dirac naturally arises by imposing lepton number conservation and adding soft-term breaking $Z_2$ symmetry model. As expected, there are interesting outcomes $\mu \rightarrow e \gamma$, but we noticed that relativistic neutrinos, $N_{\text{eff}}$, has greater impact...
We discuss inflation in models with large extra dimensions, driven by a bulk scalar field. The brane inflaton is then single effective field, obtained from the field scaling. self-interaction terms of are naturally suppressed. picture consistent fundamental string scale TeV range without problem superlight inflaton. If hybrid considered, right prediction for density perturbations as observed Cosmic Background Explorer can be any fine-tuning. decays preferentially into Higgs fields and...
In this work we show that light right-handed neutrinos, with mass in the sub-eV scale, is a natural outcome 3-3-1 model. By considering effective dimension five operators, model predicts three weakly mixed left-handed ones. We also able to explain LSND experiment and still be agreement solar atmospheric data for neutrino oscillation.
We show that Peccei-Quinn and lepton number symmetries can be a natural outcome in 3-3-1 model with right-handed neutrinos after imposing ${Z}_{11}\ensuremath{\bigotimes}{Z}_{2}$ symmetry. This symmetry is suitably accommodated this when we augment its spectrum by including merely one singlet scalar field. work out the breaking of symmetry, yielding axion, study phenomenological consequences. The main result solution to strong CP problem implemented way, implying an invisible axion...
In this work we study the structure of electromagnetic interactions and electric charge quantization in gauge theories electroweak based on semi-simple groups. We show that standard model is strongly correlated to pattern charges. examine these two questions also all possible chiral bilepton models interactions. they can explain vectorlike nature together demanding nonvanishing fermion masses anomaly cancellations.
The simplest non-abelian gauge extension of the electroweak standard model, $SU(3)_c\otimes SU(3)_L\otimes U(1)_N$, known as 3-3-1 has a minimal version which demands least possible fermionic content to account for whole established phenomenology well particles and interactions. Nevertheless, in its original form model was proposed with set three scalar triplets one sextet order yield spontaneous breaking symmetry generate observed fermion masses. Such huge sector turns task clearly...
We construct a full left-right model for the electroweak interactions based on $SU(3)_{L}\otimes SU(3)_{R}\otimes U(1)_{X}$ gauge symmetry. The fermion content of is such that anomaly cancellation restricts number families to be multiple three. One most important features joint presence three light active neutrinos, additional neutrinos at keV mass scale, and six heavy ones with masses around\textbf{$10^{11}$} GeV. They form well-motivated part spectrum in sense they address challenging...
Some years ago it was shown by Ma that in the context of electroweak standard model there are, at tree level, only three ways to generate small neutrino masses seesaw mechanism via one effective dimension-five operator. Here we extend this approach 3-3-1 chiral models showing case are several operators and also consider their level realization.
We adapt the type II seesaw mechanism to framework of 3-3-1 model with right-handed neutrinos. emphasize that is capable generating small masses for left-handed and neutrinos structure allows both arise from same Yukawa coupling. For typical values free parameters we may obtain at least one neutrino mass in KeV range. Right-handed this range a viable candidate warm component dark matter existent universe.
The common lore in the literature of neutrino mass generation is that canonical see-saw mechanism beautifully offers an explanation for tiny but at cost introducing right-handed neutrinos a scale out range current experiments. inverse interesting alternative to one once it leads masses with advantage being testable TeV scale. However, this last suffers from issue naturalness concerning responsible such small masses, namely, parameter $\mu$ related lepton number violation and supposed be keV...
We have witnessed a persistent puzzling anomaly in the muon magnetic moment that cannot be accounted for Standard Model even considering existing large hadronic uncertainties. A new measurement is forthcoming, and it might give rise to 5σ claim physics beyond Model. Motivated by it, we explore implications of this result five models based on SU(3)C×SU(3)L×U(1)N gauge symmetry put our conclusions into perspective with LHC bounds. show previous found context such change if there are more than...
In this work we introduce scalar leptoquarks into the 3-3-1 model with right-handed neutrinos aim of solving (g−2)μ puzzle. We show that besides supports in octet, sextet, triplet and singlet representations, identified only one specif leptoquark representation leads to flip chirality as required generate positive robust contribution (g−2)μ. Then calculate its contributions decay process μ→eγ discuss results.
In the original version of minimal $SU(3{)}_{C}\ifmmode\times\else\texttimes\fi{}SU(3{)}_{L}\ifmmode\times\else\texttimes\fi{}U(1{)}_{N}$ model masses all quarks are correctly obtained by introducing three scalar triplets into model; meanwhile lepton mass generation requires introduction at least one sextet. this work we show that sextet is unable to yield correct neutrino and mixing. order solve puzzle in most economical way, evoke an additional ${Z}_{3}$ discrete symmetry, without...