Speaker
Dr
Shintaro Eijima
(KEK)
Description
Introducing right-handed neutrinos to the Standard Model is one of promising solutions for non-zero neutrino masses and the baryon asymmetry of the universe. The new particles with masses below the electroweak scale are called heavy neutral leptons (HNLs), which are directly testable in high-intensity experiments. In two HNL case we evaluate a parameter space explaining the observed baryon asymmetry and compare it with sensitivity of near-future experiment. Further a HNL with the mass of keV scale is a candidate of dark matter, and it is known that sizable lepton asymmetries are required to realize the observed dark matter abundance. We discuss production of the asymmetries via physics of heavier HNLs as well.
