Leptoflavorgenesis: baryon asymmetry of the Universe from lepton flavor
  violation
  Charged-lepton flavor violation (CLFV) is a smoking-gun signature of physics
beyond the Standard Model. The discovery of CLFV in upcoming experiments would
indicate that CLFV processes must have been efficient in the early Universe at
relatively low temperatures. In this letter, we point out that such efficient
CLFV interactions open up new ways of creating the baryon asymmetry of the
Universe. First, we revisit the one-loop corrections from charged-lepton Yukawa
interactions to the chemical transport in the Standard Model plasma, which
imply that nonzero lepton flavor asymmetries summing up to $B-L = 0$ are enough
to generate the baryon asymmetry. Then, we describe two scenarios of what we
call {\it leptoflavorgenesis}, where efficient CLFV processes are responsible
for the generation of primordial lepton flavor asymmetries that are
subsequently converted to a baryon asymmetry by weak sphaleron processes. Here,
the conversion factor from lepton flavor asymmetry to baryon asymmetry is
suppressed by charged-lepton Yukawa couplings squared, which provides a natural
explanation for the smallness of the observed baryon-to-photon ratio.
