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Towards a complete theory of thermal leptogenesis in the SM and MSSM

G. F. Giudice·A. Notari·M. Raidal·A. Riotto·A. Strumia
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Abstract

We perform a thorough study of thermal leptogenesis adding finite temperature effects, RGE corrections, scatterings involving gauge bosons and by properly avoiding overcounting on-shell processes. Assuming hierarchical right-handed neutrinos with arbitrary abundancy, successful leptogenesis can be achieved if left-handed neutrinos are lighter than 0.15 eV and right-handed neutrinos heavier than 2 10^7 GeV (SM case, 3sigma C.L.). MSSM results are similar. Furthermore, we study how reheating after inflation affects thermal leptogenesis. Assuming that the inflaton reheats SM particles but not directly right-handed neutrinos, we derive the lower bound on the reheating temperature to be T_RH > 2 10^9 GeV. This bound conflicts with the cosmological gravitino bound present in supersymmetric theories. We study some scenarios that avoid this conflict: `soft leptogenesis', leptogenesis in presence of a large right-handed (s)neutrino abundancy or of a sneutrino condensate.

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G. F. Giudice, A. Notari, M. Raidal, A. Riotto, A. Strumia. 2003-10-10. Towards a complete theory of thermal leptogenesis in the SM and MSSM. https://doi.org/10.1016/j.nuclphysb.2004.02.019

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