A possible relation between leptogenesis and PMNS phases
  We propose a new scenario for baryogenesis through leptogenesis, where the CP
phase relevant for leptogenesis is connected directly to the PMNS phase(s) in
the light neutrino mixing matrix. The scenario is realized in case only one CP
phase appears in the full theory, originating from the complex vacuum
expextation value of a standard model singlet field. In order to realize this
scheme, the electroweak symmetry is required to be broken during the
leptogenesis era and a new loop diagram with an intermediate $W$ boson exchange
including the low energy neutrino mixing matrix should play the dominant
contribution to the CP violation for leptogenesis. In this letter, we discuss
the new basic mechanism, which we call type-II leptogenesis, and give an
estimate for maximally reachable baryon asymmetry depending on the PMNS phases.
