Unstable heavy Majorana neutrinos and leptogenesis

by G. MIELE (INFN, Naples)

Monday 13 Dec 1999, 14:00 → 14:15 Europe/Zurich

TH Auditorium (CERN)

We propose a new mechanism producing a non-vanishing lepton number asymmetry, based on the interference of decay amplitudes of heavy Majorana neutrinos. If neutrinos are produced out of equilibrium, as occurs in preheating scenario, and are superposition's of mass eigenstates rapidly decaying, their decay amplitudes may interfere provided the mass differences Dm are small compared to widths G. The resulting lepton asymmetry is found to be proportional to Dm/G.