Speaker
Mr
Sven Baumholzer
(Johannes Gutenberg-Universitaet Mainz)
Description
This talk is based on [arXiv:1806.06864][1].
We will present an extension of the Standard Model, including three right-handed neutrinos $N_i$ and a new Higgs doublet $\Sigma$, all charged under a exact $Z_2$ parity symmetry. This framework is also known as the "Scotogenic model".
We will discuss how one can realize the SM neutrino masses + mixing angles and also generate the observed DM density and the baryon asymmetry of the universe (BAU) in this model framework. The DM is suppossed to be a keV right-handed neutrino which is mainly produced via a freeze-in mechanism given by decays of the new scalars. The BAU is generated via Leptogenesis, which relies on two CP violating mechanisms:
1) Oscillations among the RH neutrinos
2) Heavy scalar decays $\Sigma \to N L$
Combining everything, we found a quite constraint parameter region which places an upper bound on the allowed DM mass of $\mathcal{O} (20)\,\mathrm{keV}$ at most.
[1]: https://arxiv.org/abs/1806.06864 "arXiv:1806.06864"
Primary author
Mr
Sven Baumholzer
(Johannes Gutenberg-Universitaet Mainz)
Co-authors
Prof.
Pedro Schwaller
(CERN)
Mr
Vedran Brdar
(MPIK Heidelberg)
