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Title: Lepton number violation as a key to low-scale leptogenesis

We explore the possibility of having a successful leptogenesis through oscillations between new sterile fermion states added to the Standard Model field content in a well motivated framework, naturally giving rise to the required mass splitting between the sterile states through a small total lepton number violation. We propose a framework with only two sterile states forming a pseudo-Dirac state, in which their mass difference as well as the smallness of the neutrino masses are due to two sources of lepton number violation with ΔL=2, corresponding to an Inverse Seesaw framework extended by a Linear Seesaw mass term. We also explore the pure Inverse Seesaw mechanism in its minimal version, requiring at least four new sterile states in order to comply with neutrino data. Our analytical and numerical studies reveal that one can have a successful leptogenesis at the temperature of the electroweak scale through oscillations between the two sterile states with a “natural” origin of the strong degeneracy in their mass spectrum. We also revisit the analytical expression of the baryon asymmetry of the Universe in the weak washout regime of this framework.
Authors:
;  [1] ;  [2] ;  [3] ;  [1] ;  [3]
  1. Laboratoire de Physique Théorique, CNRS, Univ. Paris-Sud, Université Paris-Saclay,Rue Henri Becquerel Batiment 210, Orsay, 91405 (France)
  2. SISSA,Via Bonomea 265, Trieste, 34136 (Italy)
  3. (Italy)
Publication Date:
OSTI Identifier:
22458406
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 11; Other Information: PUBLISHER-ID: JCAP11(2015)041; OAI: oai:repo.scoap3.org:12774; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Sponsoring Org:
SCOAP3, CERN, Geneva (Switzerland)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; BARYONS; INVARIANCE PRINCIPLES; LEPTON NUMBER; MASS DIFFERENCE; MASS SPECTRA; NEUTRINOS; NUMERICAL ANALYSIS; PARTICLE PRODUCTION; STANDARD MODEL; UNIVERSE