Limits on $T_{RH}$ for thermal leptogenesis with hierarchical neutrino masses

P. H. Chankowski; K. Turzynski

doi:10.1016/j.physletb.2003.08.004

paper

Limits on $T_{R H}$ for thermal leptogenesis with hierarchical neutrino masses

arXiv:hep-ph/0306059 · doi:10.1016/j.physletb.2003.08.004

Abstract

We make a simple observation that if one of the right-chiral neutrinos is very heavy or its Yukawa couplings to the standard lepton doublets are negligible, so that it effectively decouples from the see-saw mechanism, the prediction for the baryon asymmetry of the Universe resulting from leptogenesis depends, apart from the masses $M_{1}$ and $M_{2}$ of the remaining two right-chiral neutrinos, only on the element $\YY{22}$ of the neutrino Yukawa coupling. For $M_2\simgt10M_1$ the lower bound on $M_{1}$ and also on $T_{reh}$ , resulting from the requirement of 'successful leptogenesis' is then significantly increased compared to the one computed recently by Buchmüller {\it et al.} in the most general case. Within the framework of thermal leptogenesis, the only way to lower this limit is then to allow for sufficiently small mass difference $M_{2} - M_{1}$ .

one reference added, a few minor rewordings

Limits on $T_{R H}$ for thermal leptogenesis with hierarchical neutrino masses

Abstract

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Limits on TRH​ for thermal leptogenesis with hierarchical neutrino masses

Abstract

References in corpus (6)

Cited by in corpus (33)

Limits on $T_{R H}$ for thermal leptogenesis with hierarchical neutrino masses