In hierarchical seesaw leptogenesis, the required lightest heavy-neutrino mass sits between about 10^8 and 10^10 GeV for typical fine-tuning and can fall to 10^6 GeV with strong fine-tuning, as a function of the lightest neutrino mass and the 0νββ effective mass.
A bound on neutrino masses from baryogenesis
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Properties of neutrinos, the lightest of all elementary particles, may be the origin of the entire matter-antimatter asymmetry of the universe. This requires that neutrinos are Majorana particles, which are equal to their antiparticles, and that their masses are sufficiently small. Leptogenesis, the theory explaining the cosmic matter-antimatter asymmetry, predicts that all neutrino masses are smaller than 0.2 eV, which will be tested by forthcoming laboratory experiments and by cosmology.
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Insights on the Scale of Leptogenesis from Neutrino Masses and Neutrinoless Double-Beta Decay
In hierarchical seesaw leptogenesis, the required lightest heavy-neutrino mass sits between about 10^8 and 10^10 GeV for typical fine-tuning and can fall to 10^6 GeV with strong fine-tuning, as a function of the lightest neutrino mass and the 0νββ effective mass.