Leptogenesis in the exceptional supersymmetric standard model: flavour dependent lepton asymmetries

2008/06/30 by S. F. King, Stephen F. King, R. Luo +4
Physics and Astronomy · #Asymmetry #CP violation #Dark Matter and Cosmic Phenomena #Electron #Flavour #Higgs boson #Leptogenesis #Lepton #Lepton number #Minimal Supersymmetric Standard Model #Neutrino #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #hep-ph

paper · pdf · doi:10.1088/1126-6708/2008/12/042

published as JHEP 0812:042,2008 · 40 pages, 9 figures, references added, subsection added

arxiv created 2008/10/08 · openalex publication_date 2008/12/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We calculate flavour dependent lepton asymmetries within the E₆ inspired Supersymmetric Standard Model (\rm E₆SSM), which has an extra U(1)_N symmetry. In this model, the right-handed neutrino doesn't participate in gauge interactions, allowing it to be used for both the see--saw mechanism and leptogenesis. Extra Higgs, leptons and leptoquarks predicted by the E₆SSM contribute to the ordinary lepton CP asymmetries induced by the decays of the lightest right--handed neutrino (and sneutrino) and give rise to a set of extra decay asymmetries. We find that the CP asymmetries can be relatively large, even when the lightest right--handed neutrino is as light as 10⁶ GeV.

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