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Probing Leptogenesis at Future Colliders

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Drewes, Marco [UCL]

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.

Type de document Article de périodique (Journal article)
Type d'accès Accès libre
Année de publication 2018
Langue Anglais
Information sur le périodique "Journal of High Energy Physics" - Vol. JHEP09, no., p. 124 (2018)
Peer reviewed oui
Editeur Institute of Physics
issn 1029-8479
e-issn 1029-8479
Statut de la publication Publié
Affiliations UCL - SST/IRMP - Institut de recherche en mathématique et physique
Liens
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Référence bibliographique Drewes, Marco ; et. al. Probing Leptogenesis at Future Colliders. In: Journal of High Energy Physics, Vol. JHEP09, no., p. 124 (2018)
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