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Neutrino Masses and Mixings from String Theory Instantons

AutorAntusch, Stefan; Ibáñez, Luis E. ; Macri, Tommaso
Palabras claveNonperturbative Effects
Superstring Vacua
Neutrino Physics
Intersecting branes models
High Energy Physics - Phenomenology
High Energy Physics - Theory
Fecha de publicación14-jun-2007
EditorInstitute of Physics Publishing
CitaciónarXiv:0706.2132v1 [hep-ph]
JHEP 09 (2007) 087
SerieIFT-UAM/CSIC 07-35
ResumenWe study possible patterns of neutrino masses and mixings in string models in which Majorana neutrino masses are generated by a certain class of string theory instantons recently considered in the literature. These instantons may generate either directly the dim=5 Weinberg operator or right-handed neutrino Majorana masses, both with a certain flavour-factorised form. A hierarchy of neutrino masses naturally appears from the exponentially suppressed contributions of different instantons. The flavour structure is controlled by string amplitudes involving neutrino fields and charged instanton zero modes. For some simple choices for these amplitudes one finds neutrino mixing patterns consistent with experimental results. In particular, we find that a tri-bimaximal mixing pattern is obtained for simple symmetric values of the string correlators.
Descripción24 pages, 2 figures.-- Published in: JHEP09(2007)087.
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