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Neutrino Masses, Mixing and New Physics Effects
We introduce a parametrization of the effects of radiative corrections from new physics on the charged lepton and neutrino mass matrices, studying how several relevant quantities describing the pattern of neutrino masses and mixing are affected by these corrections. We find that the ratio omega = si...
Autores principales: | , , |
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Lenguaje: | eng |
Publicado: |
2003
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Materias: | |
Acceso en línea: | http://cds.cern.ch/record/679152 |
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author | Aguilar-Saavedra, J A Branco, Gustavo Castello Joaquim, F R |
author_facet | Aguilar-Saavedra, J A Branco, Gustavo Castello Joaquim, F R |
author_sort | Aguilar-Saavedra, J A |
collection | CERN |
description | We introduce a parametrization of the effects of radiative corrections from new physics on the charged lepton and neutrino mass matrices, studying how several relevant quantities describing the pattern of neutrino masses and mixing are affected by these corrections. We find that the ratio omega = sin theta / tan theta_atm is remarkably stable, even when relatively large corrections are added to the original mass matrices. It is also found that if the lightest neutrino has a mass around 0.3 eV, the pattern of masses and mixings is considerably more stable under perturbations than for a lighter or heavier spectrum. We explore the consequences of perturbations on some flavor relations given in the literature. In addition, for a quasi-degenerate neutrino spectrum it is shown that: (i) starting from a bi-maximal mixing scenario, the corrections to the mass matrices keep tan theta_atm very close to unity while they can lower tan theta_sol to its measured value; (ii) beginning from a scenario with a vanishing Dirac phase, corrections can induce a Dirac phase large enough to yield CP violation observable in neutrino oscillations. |
id | cern-679152 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2003 |
record_format | invenio |
spelling | cern-6791522019-09-30T06:29:59Zhttp://cds.cern.ch/record/679152engAguilar-Saavedra, J ABranco, Gustavo CastelloJoaquim, F RNeutrino Masses, Mixing and New Physics EffectsParticle Physics - PhenomenologyWe introduce a parametrization of the effects of radiative corrections from new physics on the charged lepton and neutrino mass matrices, studying how several relevant quantities describing the pattern of neutrino masses and mixing are affected by these corrections. We find that the ratio omega = sin theta / tan theta_atm is remarkably stable, even when relatively large corrections are added to the original mass matrices. It is also found that if the lightest neutrino has a mass around 0.3 eV, the pattern of masses and mixings is considerably more stable under perturbations than for a lighter or heavier spectrum. We explore the consequences of perturbations on some flavor relations given in the literature. In addition, for a quasi-degenerate neutrino spectrum it is shown that: (i) starting from a bi-maximal mixing scenario, the corrections to the mass matrices keep tan theta_atm very close to unity while they can lower tan theta_sol to its measured value; (ii) beginning from a scenario with a vanishing Dirac phase, corrections can induce a Dirac phase large enough to yield CP violation observable in neutrino oscillations.hep-ph/0310305oai:cds.cern.ch:6791522003-10-27 |
spellingShingle | Particle Physics - Phenomenology Aguilar-Saavedra, J A Branco, Gustavo Castello Joaquim, F R Neutrino Masses, Mixing and New Physics Effects |
title | Neutrino Masses, Mixing and New Physics Effects |
title_full | Neutrino Masses, Mixing and New Physics Effects |
title_fullStr | Neutrino Masses, Mixing and New Physics Effects |
title_full_unstemmed | Neutrino Masses, Mixing and New Physics Effects |
title_short | Neutrino Masses, Mixing and New Physics Effects |
title_sort | neutrino masses, mixing and new physics effects |
topic | Particle Physics - Phenomenology |
url | http://cds.cern.ch/record/679152 |
work_keys_str_mv | AT aguilarsaavedraja neutrinomassesmixingandnewphysicseffects AT brancogustavocastello neutrinomassesmixingandnewphysicseffects AT joaquimfr neutrinomassesmixingandnewphysicseffects |