The importance of N2 leptogenesis
| dc.creator | Engelhard, Guy | |
| dc.creator | Grossman, Yuval | |
| dc.creator | Nardi, Enrico | |
| dc.creator | Nir, Yosef | |
| dc.date | 2006-12-15 | |
| dc.date | 2007-09-17 | |
| dc.date.accessioned | 2026-07-07T11:02:23Z | |
| dc.date.available | 2026-07-07T11:02:23Z | |
| dc.description | We argue that fast interactions of the lightest singlet neutrino $N_1$ would project part of a preexisting lepton asymmetry $L_p$ onto a direction that is protected from $N_1$ washout effects, thus preventing it from being erased. In particular, we consider an asymmetry generated in $N_2$ decays, assuming that $N_1$ interactions are fast enough to bring $N_1$ into full thermal equilibrium. If $N_1$ decays occur at $T\gsim 10^9$ GeV, that is, before the muon Yukawa interactions enter into thermal equilibrium, then generically part of $L_p$ survives. In this case some of the constraints implied by the standard $N_1$ leptogenesis scenario hold only if $L_p \approx 0$. For $T\lsim 10^9$ GeV, $L_p$ is generally erased, unless special alignment/orthogonality conditions in flavor space are realized. | |
| dc.description | 5 pages. A few clarifications added, conclusions unchanged. Version published in Phys. Rev. Lett. (Title changed in journal) | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0612187 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0612187 | |
| dc.identifier | Phys.Rev.Lett.99:081802,2007 | |
| dc.identifier | doi:10.1103/PhysRevLett.99.081802 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/188238 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | The importance of N2 leptogenesis | |
| dc.type | text |