Phenomenology 2025 Symposium

Testable Flavored TeV-scale Resonant Leptogenesis with MeV-GeV Dark Matter

20 May 2025, 17:45

15m

David Lawrence Hall 209, University of Pittsburgh

New Ideas in Baryogenesis and Inflation New Ideas in Baryogenesis, Inflation

Speaker

Kairui Zhang (University of Oklahoma-Norman)

Description

We explore flavored resonant leptogenesis embedded in a neutrinophilic 2HDM. Successful leptogenesis is achieved by the very mildly degenerate two heavier right-handed neutrinos~(RHNs) $N_2$ and $N_3$ with a level of only $\mathrm{\Delta }{M}_{32}/M_2\sim \mathcal{O}(0.1\mathrm{\%}-1\mathrm{\%})$. The lightest RHN, with a MeV–GeV mass, lies below the sphaleron freeze-out temperature and is stable, serving as a dark matter candidate. The model enables TeV-scale leptogenesis while avoiding the extreme mass degeneracy typically plagued conventional resonant leptogenesis. Baryon asymmetry, neutrino masses, and potentially even dark matter relic density can be addressed within a unified, experimentally testable framework.

Presentation materials

lepto_slides.pdf