PPC 2024: XVII International Conference on Interconnections between Particle Physics and Cosmology

On Exploring Leptogenesis in an Extension of the Scotogenic Model

16 Oct 2024, 14:45

15m

Seminar Room 3-4, Convention Center (IIT Hyderabad)

Parallel talk Parallel - Neutrino

Speaker

Mr Labh Singh (Central University of Himachal Pradesh)

Description

We investigate the potential for low-scale leptogenesis and WIMP dark matter within the singlet-triplet scotogenic model (STScM). First, we examine the scenario with two heavy right-handed fermion (HRF) fields, $N$ and $\mathrm{\Sigma }$, which exhibit a moderate mass hierarchy. In this setup, the out-of-equilibrium decays of both HRFs generate a lepton asymmetry. Our analysis shows that the leptogenesis scale in this case is similar to that of standard thermal leptogenesis, with $M_{N,\mathrm{\Sigma }}\sim {10}^9$ GeV, as seen in the Type-I seesaw mechanism. In the second scenario, we conduct a detailed study with three HRFs ($N_1,N_2,\mathrm{\Sigma }$), where the mass hierarchy $M_{N_1}<M_{\mathrm{\Sigma }}\ll M_{N_2}$ significantly lowers the scale of leptogenesis, bringing it down to the TeV range. In this model, the dark matter candidate is the real component of the neutral part of the inert scalar ($\eta$).

Presentation materials

PPC2024_Labh.pdf