Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-10-10
Nucl.Phys.B685:89-149,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
56 pages, many figures (17) and appendices (20 pages). v2: ref.s added, final version. Results available at http://www.cern.
Scientific paper
10.1016/j.nuclphysb.2004.02.019
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.
Giudice Gian F.
Notari Alessio
Raidal Martti
Riotto Antonio
Strumia Alessandro
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