Annihilating Leptogenesis

Understand

Leptogenesis is usually realized through decays of heavy particles.

• In this article we consider another possibility of generating a lepton asymmetry through annihilations of heavy particles.
• We demonstrate our idea with a realistic extension of the standard model containing a heavy doublet and a light singlet scalars in addition to right-handed neutrinos and Higgs triplets required for type-I+II seesaw of neutrino masses.
• We also clarify that this annihilating leptogenesis scenario can be naturally embedded in more fundamental theories, like left-right symmetric models or grand unified theories.