2017/10/31 by Stefan Antusch, Eros Cazzato, Marco Drewes +6
Physics and Astronomy · #Baryogenesis #Baryon asymmetry #Dark Matter and Cosmic Phenomena #Electron #Leptogenesis #Lepton #Lepton number #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Seesaw mechanism #Sterile neutrino #astro-ph.CO #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep09(2018)124
30 pages plus appendix, 13 figures, references added, discussion extended, two figures added, matches journal version
openalex publication_date 2018/09/01 · arxiv created 2018/10/22 · arxiv updated 2018/10/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A bstract We investigate the question whether leptogenesis, as a mechanism for explaining the baryon asymmetry of the universe, can be tested at future colliders. Focusing on the minimal scenario of two right-handed neutrinos, we identify the allowed parameter space for successful leptogenesis in the heavy neutrino mass range between 5 and 50 GeV. Our calculation includes the lepton flavour violating contribution from heavy neutrino oscillations as well as the lepton number violating contribution from Higgs decays to the baryon asymmetry of the universe. We confront this parameter space region with the discovery potential for heavy neutrinos at future lepton colliders, which can be very sensitive in this mass range via displaced vertex searches. Beyond the discovery of heavy neutrinos, we study the precision at which the flavour-dependent active-sterile mixing angles can be measured. The measurement of these mixing angles at future colliders can test whether a minimal type I seesaw mechanism is the origin of the light neutrino masses, and it can be a first step towards probing leptogenesis as the mechanism of baryogenesis. We discuss how a stronger test could be achieved with an additional measurement of the heavy neutrino mass difference.