SO(10) unified models and soft leptogenesis

2007/02/28 by E. J. Chun, Liliana Velasco-Sevilla, L. Velasco-Sevilla · 13 citations
Physics and Astronomy · #Asymmetry #Baryon asymmetry #CP violation #Dark Matter and Cosmic Phenomena #Leptogenesis #Lepton #MAJORANA #Mass matrix #Neutrino #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Yukawa potential #hep-ph

paper · pdf · doi:10.1088/1126-6708/2007/08/075

published in Journal of High Energy Physics 2007(08), 075 (Springer Nature) · 26 pages, 2 figures. Added references, new appendix of a relevant fit and improved comments

arxiv created 2007/05/10 · openalex publication_date 2007/08/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Motivated by the fact that, in some realistic models combining SO(10) GUTs and flavour symmetries, it is not possible to achieve the required baryon asymmetry through the CP asymmetry generated in the decay of right-handed neutrinos, we take a fresh look on how deep this connection is in SO(10). The common characteristics of these models are that they use the see-saw with right-handed neutrinos, predict a normal hierarchy of masses for the neutrinos observed in oscillating experiments and in the basis where the right-handed Majorana mass is diagonal, the charged lepton mixings are tiny. In addition these models link the up-quark Yukawa matrix to the neutrino Yukawa matrix Y^νwith the special feature of Y^ν₁₁-> 0 Using this condition, we find that the required baryon asymmetry of the Universe can be explained by the soft leptogenesis using the soft B parameter of the second lightest right-handed neutrino whose mass turns out to be around 10⁸ GeV. It is pointed out that a natural way to do so is to use no-scale supergravity where the value of B ~1 GeV is set through gauge-loop corrections.

Citations

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• Review of Particle Physics
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