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Journal of High Energy Physics

, 2018:124 | Cite as

Probing leptogenesis at future colliders

  • Stefan Antusch
  • Eros Cazzato
  • Marco Drewes
  • Oliver Fischer
  • Björn Garbrecht
  • Dario Gueter
  • Juraj KlarićEmail author
Open Access
Regular Article - Theoretical Physics

Abstract

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.

Keywords

Cosmology of Theories beyond the SM Neutrino Physics Beyond Standard Model 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  • Stefan Antusch
    • 1
    • 2
  • Eros Cazzato
    • 1
  • Marco Drewes
    • 3
    • 4
    • 5
  • Oliver Fischer
    • 1
    • 6
  • Björn Garbrecht
    • 4
  • Dario Gueter
    • 2
    • 4
    • 5
  • Juraj Klarić
    • 4
    • 5
    Email author
  1. 1.Department of PhysicsUniversity of BaselBaselSwitzerland
  2. 2.Max-Planck-Institut für Physik (Werner-Heisenberg-Institut)MünchenGermany
  3. 3.Centre for Cosmology, Particle Physics and PhenomenologyUniversité catholique de LouvainLouvain-la-NeuveBelgium
  4. 4.Physik Department T70, Technische Universität MünchenGarchingGermany
  5. 5.Excellence Cluster UniverseGarchingGermany
  6. 6.Institute for Nuclear Physics, Karlsruhe Institute of TechnologyEggenstein-LeopoldshafenGermany

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