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Journal of High Energy Physics

, 2019:164 | Cite as

Low-scale leptogenesis with three heavy neutrinos

  • Asmaa Abada
  • Giorgio Arcadi
  • Valerie Domcke
  • Marco Drewes
  • Juraj Klaric
  • Michele LucenteEmail author
Open Access
Regular Article - Theoretical Physics
  • 15 Downloads

Abstract

Leptogenesis induced by the oscillations of GeV-scale neutrinos provides a minimal and testable explanation of the baryon asymmetry of the Universe. In this work we extend previous studies invoking only two heavy neutrinos to the case of three heavy neutrinos. We find qualitatively new behaviour as a result of lepton number violating oscillations and decays, strong flavour effects in the washout and a resonant enhancement due to matter effects. An approximate global \( B-\overline{L} \) symmetry (representing the difference of baryon and a generalised lepton number) can protect the light neutrino masses from large radiative corrections, while simultaneously providing the ingredients for the resonant enhancement of the lepton asymmetry due to thermal contributions to the heavy neutrino dispersion relations. This mechanism is particularly efficient for large heavy neutrino mixing angles near the current experimental limits, a regime in which leptogenesis is not feasible in the minimal scenario with two heavy neutrinos. In this new parameter regime, low-scale leptogenesis is testable by the LHC and other existing experiments.

Keywords

Cosmology of Theories beyond the SM Neutrino Physics Thermal Field Theory CP violation 

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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© The Author(s) 2019

Authors and Affiliations

  1. 1.Laboratoire de Physique Théorique (UMR8627), CNRS, Univ. Paris-Sud, Université Paris-SaclayOrsayFrance
  2. 2.Max-Planck-Institut für Kernphysik (MPIK)HeidelbergGermany
  3. 3.Deutsches Elektronen-Synchrotron (DESY)HamburgGermany
  4. 4.Centre for Cosmology, Particle Physics and Phenomenology, Université catholique de LouvainLouvain-la-NeuveBelgium
  5. 5.Technische Universität München (TUM)GarchingGermany
  6. 6.Institute of Physics, Laboratory for Particle Physics and Cosmology (LPPC), Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland

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