title: Leptogenesis via collisions: leaking lepton number to the hidden sector.
abstract: We propose a leptobaryogenesis mechanism in which the nonzero B-L 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 l phi-->l(')phi('),l macro(')phi(') mediated by the heavy Majorana neutrinos N of the seesaw mechanism, where l and phi are ordinary lepton and Higgs doublets and l('), phi(') 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 10(9) GeV.
authors.affiliation: Centro de Física Nuclear da Universidade de Lisboa, Avenida Professor Gama Pinto 2, 1649-003 Lisboa, Portugal.
authors.forename: L
authors.initials: L
authors.lastname: Bento
authors.forename: Z
authors.initials: Z
authors.lastname: Berezhiani