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

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

2003-06-06

arxiv.org/abs/hep-ph/0306059v2

Phys.Lett. B570 (2003) 198-204

Physics

High Energy Physics

High Energy Physics - Phenomenology

one reference added, a few minor rewordings

Scientific paper

10.1016/j.physletb.2003.08.004

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 $T_{\rm reh}$, resulting from the requirement of 'successful leptogenesis' is then significantly increased compared to the one computed recently by Buchm\"uller {\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 $M_2-M_1$.

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