Neutrino Mass
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Fenomenologia de neutrinos atmosféricos com neutrinos de massa variável / Atmospheric neutrino phenomenology with mass varying neutrinos
Neste trabalho obtemos de forma independente a descrição da distribuição angular dos eventos de neutrinos atmosféricos vistos pelo detector Super-Kamiokande tanto para as regiões de sub-GeV como multi-GeV. Para tal, estudamos de forma detalhada a seção de choque neutrinonucleon para processos de espalhamento via corrente carregada para todo o interva
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/05/2012
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2. Fenomenologia dos decaimentos de neutrinos de supernova / Decay phenomenology of supernova neutrinos
Here we present a study of the phenomenology of neutrinos, which starts with a model beyond the Standard Model, which generates mass and decay to neutrinos. The model was proposed by Gelmini and Roncadelli cite Gelmini: 1981, the model needs a triplet that interacts with the scaling doublet Higgs through different potential climb. The triplet also interacts
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/11/2011
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3. A mistura dos bósons Z − Z′ e a quebra explícita da simetria leptônica no modelo 331 com neutrinos de mao direita
In this thesis, we develop some phenomenological aspects of a model based on the gauge symmetry SU(3)CNSU(3)LNU(1)N (311νR), that include righthanded neurinos in its matter content. We establish all the necessary structure for the study of the phenomenological aspects of the model. First, we obtain bounds on the angle that mix the gauge bosons Z and Z
Publicado em: 2009
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4. IMPACTO DO FUNDO CÓSMICO DE NEUTRINO NA EXPANSÃO DO UNIVERSO / IMPACT OF THE COSMIC NEUTRINO BACKGROUND IN THE EXPANSION OF THE UNIVERSE
Os neutrinos são produzidos copiosamente no Universo primordial e são hoje as espécies mais abundantes de partículas após os fótons. Com a descoberta da oscilação de neutrinos sabe-se que eles possuem massa. Os efeitos de neutrinos na formação de estruturas têm sido muito estudados e a comparação com os dados observacionais estabelece limites so
Publicado em: 2009
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5. New limits for the violation of the equivalence prinriple on solar neutrinos / Novos limites para violação do principio da equivalencia em neutrinos solares
In this work, we studied the model for the violation of the equivalence principle (VEP) on solar and reactor neutrinos. This model was already considered as a promising solution to the solar neutrino problem (SNP), but was abandoned because it wasn?t able to explain all the data with a single set of physical parameters. The mass- avor mixing model, together
Publicado em: 2008
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6. Constraints on the environment depence of the neutrino mass from solar and reactor neutrino data
We investigate what can be the role of Mass Varying Neutrinos in several different neutrino oscillation experiments, in particular focusing on the relation between KamLAND data and solar neutrino experiment results. Assuming that the adiabaticity of solar neutrinos evolution in LMA-MSW scenario is not broken by the inclusion of this new mechanism, we can est
Brazilian Journal of Physics. Publicado em: 2007-07
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7. Polarization in the cosmic microwave background
Cosmic microwave background (CMB) studies underpin our understanding of the universe and its history. Until recently, we have relied principally on CMB temperature observations to build our standard cosmological model, but today the field forges ahead into its next frontier - CMB polarization anistropy. Polarization measurements will furnish fresh and indepe
Brazilian Journal of Physics. Publicado em: 2006-12
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8. Dark energy in the universe, the irreversibility of time and neutrinos
In this review, I discuss briefly how the presence of a cosmological constant in the Universe may imply a decoherent evolution of quantum matter in it, and as a consequence a fundamental irreversibility of time unrelated in principle to CP properties (Cosmological CPT Violation). In this context, I also discuss recently suggested novel possible contributions
Brazilian Journal of Physics. Publicado em: 2005-06
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9. Neutrinos at 1%: a reactor based measurement of theta13
Past studies of neutrinos and the recent results on neutrino mixing have opened up many new possibilities as well as the understanding that neutrino mixing is very different from the better known quark mixing. The last remaining unmeasured component of the neutrino mixing matrix (Ue3) also provides a window to understanding neutrino matter effects, the mass
Brazilian Journal of Physics. Publicado em: 2004-12
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10. Influence of the solar and density perturbations on the neutrino parameters
There are reasons to believe that the solar matter density fluctuates around an equilibrium profile. One of these reasons is a resonance between the Alfvén waves and the g-modes inside the Sun that creates spikes in the density profile. The neutrinos are created in the solar core and passing through these spikes feel them as a noisy perturbation, whose corr
Brazilian Journal of Physics. Publicado em: 2004-12
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11. Collider tests for neutrino mass generation in a supersymmetric world with R-parity violation
We summarize the low energy features of a supersymmetric class of models with bilinear R-parity violation. We analyze two cases where the supersymmetry breaking is mediated either by supergravity or by anomaly induced contributions to the soft parameters and compare both scenarios in the context of recent neutrino conversion data and collider physics. We sho
Brazilian Journal of Physics. Publicado em: 2004-03
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12. Neutrino mass, mixing and oscillations
Present data from various neutrino experiments are strongly suggesting the existence of neutrino mass and flavor mixing. We review the present status of neutrino oscillation search and various neutrino anomalies and their possible interpretations in terms of oscillation induced by neutrino mass and flavor mixing.
Brazilian Journal of Physics. Publicado em: 2000-06