Low-scale leptogenesis with three heavy neutrinos

Abada, Asmaa; Domcke, Valerie; Arcadi, Giorgio; Lucente, Michele; Klaric, Juraj; Drewes, Marco

Preprint/Report

PUBDB-2018-04139

Low-scale leptogenesis with three heavy neutrinos

Abada, A. ; Arcadi, G. ; Domcke, V.DESY* ; Drewes, M. ; Klaric, J. ; Lucente, M. (Corresponding author)

2018

This record in other databases:

Report No.: CP3-18-59; DESY-18-174; LPT-Orsay-18-85; arXiv:1810.12463

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 dynamical processes that make baryogenesis feasible in the parameter region accessible to current LHC experiments. An approximate global $B - L$ symmetry (representing the difference of baryon and generalised lepton number) can protect the light neutrino masses from large radiative corrections, while simultaneously providing the ingredients for a resonant enhancement of the lepton asymmetry due to thermal contributions to the heavy neutrino mass eigenstates. Moreover, an additional source term in the kinetic equations governing leptogenesis (absent in the case of only two right-handed neutrinos), allows for successful leptogenesis from the heavy neutrino oscillations alone, without resorting to the flavour asymmetric washout that is required in the case of two heavy neutrinos.

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