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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...

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Detalles Bibliográficos
Autores principales: Aguilar-Saavedra, J A, Branco, Gustavo Castello, Joaquim, F R
Lenguaje:eng
Publicado: 2003
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.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2003
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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