Journal
PHYSICS LETTERS B
Volume 692, Issue 2, Pages 105-113Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2010.07.016
Keywords
Neutrino masses; Baryogenesis
Funding
- Ministry of Education, Science, Sports and Culture [21540260]
- Niigata University
- Grants-in-Aid for Scientific Research [21540260, 21340055] Funding Source: KAKEN
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We investigate baryogenesis in the nu MSM, which is the Minimal Standard Model (MSM) extended by three right-handed neutrinos with Majorana masses smaller than the weak scale. In this model the baryon asymmetry of the universe (BAU) is generated via flavour oscillation between right-handed neutrinos. We consider the case when BAU is solely originated from the CP violation in the mixing matrix of active neutrinos. We perform analytical and numerical estimations of the yield of BAU, and show how BAU depends on mixing angles and CP violating phases. It is found that the asymmetry in the inverted hierarchy for neutrino masses receives a suppression factor of about 4% comparing with the normal hierarchy case. It is, however, pointed out that, when theta(13) = 0 and theta(23) = pi/4, baryogenesis in the normal hierarchy becomes ineffective, and hence the inverted hierarchy case becomes significant to account for the present BAU. (C) 2010 Elsevier B.V. All rights reserved.
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