The importance of flavor in leptogenesis

Details The importance of flavor in leptogenesis The importance of flavor in leptogenesis

2006-01-11

arxiv.org/abs/hep-ph/0601084v2

JHEP0601:164,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 2 figures. Added 3 references

Scientific paper

10.1088/1126-6708/2006/01/164

We study leptogenesis from the out-of-equilibrium decays of the lightest heavy neutrino $N_1$ in the medium (low) temperature regime, $T\lsim 10^{12}$ GeV ($10^{10}$ GeV), where the rates of processes mediated by the $\tau$ (and $\mu$) Yukawa coupling are non negligible, implying that the effects of lepton flavors must be taken into account. We find important quantitative and qualitative differences with respect to the case where flavor effects are ignored: (i) The cosmic baryon asymmetry can be enhanced by up to one order of magnitude; (ii) The sign of the asymmetry can be opposite to what one would predict from the sign of the total lepton asymmetry $\epsilon_1$; (iii) Successful leptogenesis is possible even with $\epsilon_1=0$.

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