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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2003
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/hep-ph/0310123 |
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| _version_ | 1866913038577172480 |
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| author | Giudice, G. F. Notari, A. Raidal, M. Riotto, A. Strumia, A. |
| author_facet | Giudice, G. F. Notari, A. Raidal, M. Riotto, A. Strumia, A. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_hep_ph_0310123 |
| institution | arXiv |
| publishDate | 2003 |
| record_format | arxiv |
| spellingShingle | Towards a complete theory of thermal leptogenesis in the SM and MSSM Giudice, G. F. Notari, A. Raidal, M. Riotto, A. Strumia, A. High Energy Physics - Phenomenology Astrophysics 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. |
| title | Towards a complete theory of thermal leptogenesis in the SM and MSSM |
| topic | High Energy Physics - Phenomenology Astrophysics |
| url | https://arxiv.org/abs/hep-ph/0310123 |