Common Origin of Neutrino Mass, Dark Matter and Dirac Leptogenesis
  We study the possibility of generating tiny Dirac neutrino masses at one loop
level through the \textit{scotogenic} mechanism such that one of the particles
going inside the loop can be a stable cold dark matter (DM) candidate. Majorana
mass terms of singlet fermions as well as tree level Dirac neutrino masses are
prevented by incorporating the presence of additional discrete symmetries in a
minimal fashion, which also guarantee the stability of the dark matter
candidate. Due to the absence of total lepton number violation, the observed
baryon asymmetry of the Universe is generated through the mechanism of Dirac
leptogenesis where an equal and opposite amount of leptonic asymmetry is
generated in the left and right handed sectors which are prevented from
equilibration due to tiny Dirac Yukawa couplings. Dark matter relic abundance
is generated through its usual freeze-out at a temperature much below the scale
of leptogenesis. We constrain the relevant parameter space from neutrino mass,
baryon asymmetry, Planck bound on dark matter relic abundance, and latest LUX
bound on spin independent DM-nucleon scattering cross section. We also discuss
the charged lepton flavour violation $(\mu \rightarrow e \gamma)$ and electric
dipole moment of electron in this model in the light of the latest experimental
data and constrain the parameter space of the model.
