2018/12/31 by Matthew J. Dolan, Tomasz P. Dutka, Raymond R. Volkas
Chemistry · Mathematics · Physics and Astronomy · #Asymmetry #Biology #Chemistry #Dark Matter and Cosmic Phenomena #Degeneracy (biology) #Flavor #Leptogenesis #Lepton #MAJORANA #Mass matrix #Mathematics #Neutrino #Neutrino Physics Research #Nuclear physics #Order (exchange) #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Physics #Seesaw molecular geometry #Statistics #hep-ph
paper · pdf · doi:10.1103/physrevd.99.123508
published as Phys. Rev. D 99, 123508 (2019) · 60 pages, 20 figures; v2: Added discussion and figures on the contribution of coherent sterile neutrino oscillations to asymmetry generation; other, minor changes and added references. Conclusions unchanged. Matches version to be published by PRD
openalex created_date 2019/01/11 · arxiv created 2019/05/21 · openalex publication_date 2019/06/11 · arxiv updated 2019/06/19 · openalex updated_date 2026/08/05
We analyze the feasibility of low-scale leptogenesis where the inverse seesaw (ISS) and linear seesaw (LSS) terms are not simultaneously present. In order to generate the necessary mass splittings, we adopt a minimal lepton flavor violation (MLFV) hypothesis where a sterile neutrino mass degeneracy is broken by flavor effects. We find that resonant leptogenesis is feasible in both scenarios. However, because of a flavor alignment issue, MLFV-ISS leptogenesis succeeds only with a highly tuned choice of Majorana masses. For MLFV-LSS, on the other hand, a large portion of parameter space is able to generate sufficient asymmetry. In both scenarios we find that the lightest neutrino mass must be of order 10^\ensuremath-2 eV or below for successful leptogenesis. We briefly explore implications for low-energy flavor violation experiments, in particular \ensuremathμ\ensuremath→e\ensuremathγ. We find that the future MEG-II experiment, while sensitive to MLFV in our setup, will not be sensitive to the specific regions required for resonant leptogenesis.