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- Title
Generalized ℤ × ℤ in scaling neutrino Majorana mass matrix and baryogenesis via flavored leptogenesis.
- Authors
Sinha, Roopam; Samanta, Rome; Ghosal, Ambar
- Abstract
We investigate the consequences of a generalized ℤ × ℤ symmetry on a scaling neutrino Majorana mass matrix. It enables us to determine definite analytical relations between the mixing angles θ and θ , maximal CP violation for the Dirac type and vanishing for the Majorana type. Beside the other testable predictions on the low energy neutrino parameters such as ββ decay matrix element | M | and the light neutrino masses m , the model also has intriguing consequences from the perspective of leptogenesis. With the assumption that the required CP violation for leptogenesis is created by the decay of lightest ( N ) of the heavy Majorana neutrinos, only τ -flavored leptogenesis scenario is found to be allowed in this model. For a normal (inverted) ordering of light neutrino masses, θ is found be less (greater) than its maximal value, for the final baryon asymmetry Y to be in the observed range. Besides, an upper and a lower bound on the mass of N have also been estimated. Effect of the heavier neutrinos N on final Y has been worked out subsequently. The predictions of this model will be tested in the experiments such as nEXO, LEGEND, GERDA-II, T2K, NO νA, DUNE etc.
- Subjects
NEUTRINO astrophysics; ORIGANUM; FLAVOR in particle physics; RADIOACTIVE decay; STANDARD model (Nuclear physics)
- Publication
Journal of High Energy Physics, 2017, Vol 2017, Issue 12, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP12(2017)030