Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-09-07
Phys.Lett.B659:634-639,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 3 figures. Version accepted by PLB (minor rewording, refs added)
Scientific paper
10.1016/j.physletb.2007.11.061
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.
Gu Pei-Hong
He Hong-Jian
Sarkar Utpal
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