A5061214454- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Noncommutative and Quantum Gravity Theories
- Nonlinear Partial Differential Equations
- Health, Environment, Cognitive Aging
- Digital Radiography and Breast Imaging
- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Research and Discoveries
- Advanced Mathematical Physics Problems
- Advanced Operator Algebra Research
- Solar and Space Plasma Dynamics
- Radio Astronomy Observations and Technology
- Particle accelerators and beam dynamics
- Economic Theory and Policy
- Fluid Dynamics and Turbulent Flows
- Advanced Mathematical Modeling in Engineering
- Superconducting Materials and Applications
Universidade Federal do ABC
2015-2024
Universidade Federal de São Paulo
2011
Universidade de São Paulo
2003-2007
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...
The recent detection of the cosmic microwave background polarimeter experiment BICEP2 tensor fluctuations in B-mode power spectrum basically excludes all plausible axion models where its decay constant is above $10^{13}$ GeV. Moreover, there are strong theoretical, astrophysical, and cosmological motivations for involving, addition to axion, also axion-like particles (ALPs), with constants intermediate scale range, between $10^9$ GeV Here, we present a general analysis an further ALPs derive...
The resonance S at ∼750 GeV in the diphoton channel observed by ATLAS and CMS, if it holds up, is almost certainly (S)cion of a larger dynasty UV completion that may very well be connected to hierarchy problem. At this stage, however, an effective field theory framework provides useful way parametrize searches for other channels. Assuming excess due new scalar or pseudoscalar boson, we study associated production ("S-strahlung") LHC propose several clean channels like γγℓℓ, γγℓE̸T ℓℓℓγE̸T...
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 $\ensuremath{\mu}\ensuremath{\rightarrow}e\ensuremath{\gamma}$.
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...
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 by introducing appropriate local ${Z}_{N}(N>~13)$ symmetries in electroweak models it is possible to implement an automatic Peccei-Quinn symmetry, at the same time keeping axion protected against gravitational effects. Although we consider here only extension of standard model and a particular 3-3-1 model, strategy can be used any kind model. An interesting feature this if add (i) right-handed neutrinos, (ii) conservation total lepton number, (iii) ${Z}_{2}$ ${Z}_{13}$ chiral...
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...
By introducing local ${Z}_{N}$ symmetries with $N=11,13$ in two 3-3-1 models, it is possible to implement an automatic Peccei-Quinn symmetry, keeping the axion protected against gravitational effects at same time. Both models have a ${Z}_{2}$ domain wall problem and neutrinos are strictly Dirac particles.
Some versions of the electroweak SU(3)$_L\otimesU(1)_X$ models cannot be treated within perturbation theory at energies few TeV. An extended version for these is proposed which perturbative even TeV scale posing no threatening inconsistency test future colliders. The extension presented here needs addition three octets vector leptons, leave new leptonic isotriplets in SU(2)$_L\otimesU(1)_Y$ subgroup. With this representation content running mixing angle, $\theta_W (\mu)$, such that...
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...
We propose a simple extension of the electroweak standard model based on discrete ${S}_{3}$ symmetry that is capable realizing nearly minimal Fritzsch-type texture for Dirac mass matrices both charged leptons and neutrinos. This achieved with aid additional ${Z}_{5}$ ${Z}_{3}$ symmetries, one which can be embedded in $U(1{)}_{B\ensuremath{-}L}$. Five complex scalar singlet fields are introduced addition to right-handed Although more general, modified retains successful features without...
Light pseudoscalars, or axion like particles (ALPs), are much studied due to their potential relevance the fields of particle physics, astrophysics and cosmology. The most relevant coupling ALPs from viewpoint current experimental searches is photon: in this work, we study generation as an effect quantum corrections, originated underlying Lorentz violating background. Most interestingly, show that interaction so generated turns out be invariant, thus mimicking standard photon considered...
Weakly Interacting Massive Particles (WIMPs) and axions are arguably the most compelling dark matter candidates in literature. Could they coexist as particles? More importantly, can be incorporated a well motivated framework agreement with experimental data? In this work, we show that two component realized Inert Doublet Model an elegant natural manner by virtue of spontaneous breaking Peccei-Quinn $U(1)_{PQ}$ symmetry into residual $Z_2$ symmetry. The WIMP stability is guaranteed $Z_{2}$...
We study the perturbative generation of higher-derivative operators as corrections to photon effective action, which are originated from a Lorentz violation background. Such obtained, at one-loop order, through proper-time method, using zeta function regularization. focus over lowest order and investigate their influence in propagation electromagnetic waves vacuum, presence strong, constant magnetic field. This is setting experimental relevance, since it bases active efforts measure non...
We propose a scale-invariant model with the 3-3-1-1 gauge symmetry that features universal seesaw for all fermion masses. The discrete remnant of group, matter parity, stabilizes fermionic dark candidate. scalar sector contains two triplets, minimum number to break 3-3-1 symmetry, and singlets. With help additional vector-like quarks, implementation see-saw mechanism across sectors provides partial explanation observed hierarchy masses charged leptons, neutrinos, quarks. identify lightest $...
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...
A bstract General Two Higgs Doublet Models (2HDM) are popular Standard Model extensions but feature flavor changing interactions and lack neutrino masses. We discuss a 2HDM where masses generated via type I seesaw propose an extension II mechanism with being absent the presence of U(1) gauge symmetry. After considering variety bounds such as those rising from collider electroweak precision we show that our proposal stands UV complete dark photon addressed. possible matter realization is also...
We show that by imposing local ${Z}_{13}\ensuremath{\bigotimes}{Z}_{3}$ symmetries in an $\mathrm{SU}(2)\ensuremath{\bigotimes}U(1)$ electroweak model we can implement invisible axion such a way (i) the Peccei-Quinn symmetry is automatic of classical Lagrangian, and (ii) protected from semiclassical gravitational effects. In order to be able large discrete symmetry, at same time allow general mixing each charge sector, introduce right-handed neutrinos enlarge scalar sector model. The domain...
We show that some models with $SU(3{)}_{C}\ensuremath{\bigotimes}SU(3{)}_{L}\ensuremath{\bigotimes}U(1{)}_{X}$ gauge symmetry can be realized at the electroweak scale and this is a consequence of an approximate global $SU(2{)}_{L+R}$ symmetry. This implies condition among vacuum expectation value one neutral Higgs scalars, $U(1{)}_{X}$'s coupling constant, ${g}_{X}$, sine weak mixing angle $\mathrm{sin}{\ensuremath{\theta}}_{W}$, mass $W$ boson, ${M}_{W}$. In limit in which valid it avoids...
In this work we show that the implementation of spontaneous breaking lepton number in 3-3-1 model with right-handed neutrinos gives rise to fast neutrino decay Majoron emission and generates a bunch new contributions neutrinoless double beta decay.