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Resonant leptogenesis in a predictive SO(10) grand unified model

Carl H. Albright·S. M. Barr
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Abstract

An SO(10) grand unified model considered previously by the authors featuring lopsided down quark and charged lepton mass matrices is successfully predictive and requires that the lightest two right-handed Majorana neutrinons be nearly degenerate in order to obtain the LMA solar neutrino solution. Here we use this model to test its predictions for baryogenesis through resonant-enhanced leptogenesis. With the conventional type I seesaw mechanism, the best predictions for baryogenesis appear to fall a factor of three short of the observed value. However, with a proposed type III seesaw mechanism leading to three pairs of massive pseudo-Dirac neutrinos, resonant leptogenesis is decoupled from the neutrino mass and mixing issues with successful baryogenesis easily obtained.

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Carl H. Albright, S. M. Barr. 2004-09-01. Resonant leptogenesis in a predictive SO(10) grand unified model. https://doi.org/10.1103/physrevd.70.033013

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