Abstract
We propose a leptobaryogenesis mechanism in which the nonzero of the Universe is produced in out-of-equilibrium, lepton number and CP-violating scattering processes that convert ordinary particles into particles of some hidden sector. In particular, we consider the processes mediated by the heavy Majorana neutrinos of the seesaw mechanism, where and are ordinary lepton and Higgs doublets and , are their hidden counterparts. Such a leptogenesis mechanism is effective even if the reheat temperature is much smaller than the heavy neutrino masses. In particular, it can be as low as .
- Received 6 August 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.231304
©2001 American Physical Society