Realistic Neutrinogenesis with Radiative Vertex Correction
| dc.creator | Gu, Pei-Hong | |
| dc.creator | He, Hong-Jian | |
| dc.creator | Sarkar, Utpal | |
| dc.date | 2007-09-07 | |
| dc.date | 2007-11-14 | |
| dc.date.accessioned | 2026-07-07T11:19:11Z | |
| dc.date.available | 2026-07-07T11:19:11Z | |
| dc.description | We propose a new model for naturally light Dirac neutrinos and explain the baryon asymmetry of the universe through neutrinogenesis. We extend the standard model with a real singlet scalar, a heavy singlet Dirac fermion and a heavy doublet scalar besides three right-handed neutrinos, respecting lepton number conservation and a Z_2 symmetry. The neutrinos acquire small Dirac masses due to the suppression of the weak scale over the heavy mass scale. As a key feature of our construction, once the heavy Dirac fermion and doublet scalar go out of equilibrium, their decays induce the CP asymmetry from the interference of tree-level processes with the \textit{radiative vertex corrections} (rather than the self-energy corrections). Although there is no lepton number violation, an equal and opposite amount of CP asymmetry is generated in the left-handed and the right-handed neutrinos. The left-handed lepton asymmetry would then be converted to the baryon asymmetry in the presence of the sphalerons, while the right-handed lepton asymmetry remains unaffected. | |
| dc.description | 7 pages, 3 figures. Version accepted by PLB (minor rewording, refs added) | |
| dc.identifier | https://arxiv.org/abs/0709.1019 | |
| dc.identifier | http://arxiv.org/abs/0709.1019 | |
| dc.identifier | Phys.Lett.B659:634-639,2008 | |
| dc.identifier | doi:10.1016/j.physletb.2007.11.061 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/193596 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Realistic Neutrinogenesis with Radiative Vertex Correction | |
| dc.type | text |