Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Leptogenesis from a feebly interacting dark matter sector

Jul 8, 2022, 9:15 AM
Room 11 (Magenta A)

Room 11 (Magenta A)

Parallel Talk Dark Matter Dark Matter


Suresh Chand (Indian Institute of technology Guwahati, Assam 781039)


We perform an analysis of leptogenesis in the context of a simple extension of the Standard Model with two fermions, one charged ($\chi $) and one neutral ($\psi$), in addition to three right-handed neutrinos, interacting through a charged gauge singlet scalar $S$. The dark sector ($\chi$, $\psi$ and $S$) interacts feebly and produces a relic density consistent with the existing data. The right-handed neutrinos decay into the charged scalar $S$ and a lepton, providing an additional source of CP asymmetry, along with contributing through the virtual exchange of $S$ in the standard decay channel. The advantage of this scenario is that it can generate naturally the observed baryon asymmetry of the universe, even for right-handed neutrino masses in 10 TeV region, without requiring neutrinos to be degenerate.

In-person participation Yes

Primary authors

Suresh Chand (Indian Institute of technology Guwahati, Assam 781039) Prof. Mariana Frank (Department of Physics, Concordia University, 7141 Sherbrooke St. West, Montreal, Quebec, Canada H4B 1R6) Prof. Poulose Poulose (Department of Physics, Indian Institute of Technology Guwahati, Assam 781039, India)

Presentation materials