2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/187498Assuming the Dirac-type neutrino masses m_D are related to quark or charged lepton masses, neutrino oscillation data indicate that right handed neutrino masses are in general strongly hierarchical. In particular, if m_D is similar to the up-type quark masses, the mass of the lightest right handed neutrino M_1<~10^6 GeV. We show that non-thermal leptogenesis by inflaton decay can yield sufficient baryon asymmetry despite this constraint, and discuss how the asymmetry is correlated with the low energy neutrino masses and CP-violating phases.7 pages, 5 figures. v2: added some comments and references, v3: minor corrections and additions, v4: a typo corrected, published versionHigh Energy Physics - Phenomenologytext