Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-11-28
JCAP 0702:005,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 9 figures. Minor corrections; version published in JCAP
Scientific paper
10.1088/1475-7516/2007/02/005
When lepton flavour effects in thermal leptogenesis are active, they introduce important differences with respect to the case in which they are neglected, the so-called one-flavour approximation. We investigate analytically and numerically the transition from the one-flavour to the two-flavour case when the $\tau$-lepton flavour becomes distinguishable from the other two flavours. We study the impact of the oscillations of the asymmetries in lepton flavour space on the final lepton asymmetries, for the hierarchical right-handed neutrino mass spectrum. Flavour oscillations project the lepton state on the flavour basis very efficiently. We conclude that flavour effects are relevant typically for $M_1\lsim 10^{12}$ GeV, where $M_1$ is the mass of the lightest right-handed neutrino.
Riotto Antonio
Simone Andrea de
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