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Leptogenesis in the Exceptional Supersymmetric Standard Model: flavour dependent lepton asymmetries

By S. F. King A, R. Luo B, D. J. Miller B and R. Nevzorov B


We calculate flavour dependent lepton asymmetries within the E6 inspired Supersymmetric Standard Model (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. 1 The baryon asymmetry in the universe ηB = (nB − n ¯B)/nγ = (6.21 ± 0.16) × 10−10 [1] is one of the motivations to explore physics beyond the elementary particle Standard Model (SM), if the Big Bang nucleosynthesis theory is the right description of the evolution o

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