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Leptogenesis in the neutrino option

We examine the compatibility between the Neutrino Option, in which the electroweak scale is generated by PeV mass type I seesaw Majorana neutrinos, and leptogenesis. We find the Neutrino Option is consistent with resonant leptogenesis. Working within the minimal seesaw scenario with two heavy Majora...

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Main Authors: Brivio, Ilaria (Author) , Moffat, K. (Author) , Pascoli, S. (Author) , Petcov, S. T. (Author) , Turner, J. (Author)
Format: Article (Journal)
Language:English
Published: October 7, 2019
In: Journal of high energy physics
Year: 2019, Issue: 10
ISSN:1029-8479
DOI:10.1007/JHEP10(2019)059
Online Access:Verlag, Volltext: https://doi.org/10.1007/JHEP10(2019)059
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Author Notes:I. Brivio, K. Moffat, S. Pascoli, S.T. Petcov, J. Turner

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520 |a We examine the compatibility between the Neutrino Option, in which the electroweak scale is generated by PeV mass type I seesaw Majorana neutrinos, and leptogenesis. We find the Neutrino Option is consistent with resonant leptogenesis. Working within the minimal seesaw scenario with two heavy Majorana neutrinos N1, 2, which form a pseudo-Dirac pair, we explore the viable parameter space. We find that the Neutrino Option and successful leptogenesis are compatible in the cases of a neutrino mass spectrum with normal (inverted) ordering for 1.2 × 106 < M(GeV) < 8.8 × 106(2.4 × 106 < M(GeV) < 7.4 × 106), with M = (M1 + M2)/2 and M1, 2 the masses of N1, 2. Successful leptogenesis requires that ∆M/M ≡ (M2 − M1)/M ∼ 10−8. We further show that leptogenesis can produce the baryon asymmetry of the Universe within the Neutrino Option scenario when the requisite CP violation in leptogenesis is provided exclusively by the Dirac or Majorana low energy CP violation phases of the PMNS matrix. 
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