Leptogenesis in the Neutrino Option

I. Brivio (Institut für Theoretische Physik, Universit¨at Heidelberg, Philosophenweg 16, Heidelberg, 69120, Germany) ; K. Moffat (Institute for Particle Physics Phenomenology, Department of Physics, Durham University, South Road, Durham, DH1 3LE, United Kingdom) ; S. Pascoli (Institute for Particle Physics Phenomenology, Department of Physics, Durham University, South Road, Durham, DH1 3LE, United Kingdom) ; S.T. Petcov (SISSA/INFN, Via Bonomea 265, Trieste, I-34136, Italy; Kavli IPMU (WPI), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, 277-8583, Japan) ; J. Turner (Theoretical Physics Department, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL, 60510, U.S.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 N 1, 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 = (M 1 + M 2)/2 and M 1, 2 the masses of N 1, 2. Successful leptogenesis requires that ∆M/M ≡ (M 2 − M 1)/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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  "abstracts": [
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      "source": "Springer", 
      "value": "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 N 1, 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 \u00d7 106 &lt; M(GeV) &lt; 8.8 \u00d7 106(2.4 \u00d7 106 &lt; M(GeV) &lt; 7.4 \u00d7 106), with M = (M 1 + M 2)/2 and M 1, 2 the masses of N 1, 2. Successful leptogenesis requires that \u2206M/M \u2261 (M 2 \u2212 M 1)/M \u223c 10\u22128. 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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Published on:
07 October 2019
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2019 (2019)
Issue 10
Pages 1-24
DOI:
https://doi.org/10.1007/JHEP10(2019)059
arXiv:
1905.12642
Copyrights:
The Author(s)
Licence:
CC-BY-3.0

Fulltext files: