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  • Letter
  • Open Access

Low-scale leptogenesis with low-energy Dirac CP-violation

Alessandro Granelli1,2,*, Silvia Pascoli1,2, and Serguey T. Petcov3,4,†

  • 1Dipartimento di Fisica e Astronomia, Università di Bologna, via Irnerio 46, 40126 Bologna, Italy
  • 2INFN, Sezione di Bologna, viale Berti Pichat 6/2, 40127 Bologna, Italy
  • 3INFN/SISSA, via Bonomea 265, 34136 Trieste, Italy
  • 4Kavli IPMU (WPI), UTIAS, University of Tokyo, Kashiwa, Chiba 277-8583, Japan

  • *alessandro.granelli@unibo.it
  • †Also at Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria.
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Phys. Rev. D 108, L101302 – Published 8 November, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L101302

Abstract

We study the freeze-in scenario of leptogenesis via oscillations within the type-I seesaw model with two quasidegenerate heavy Majorana neutrinos N1,2 having masses M2>M1∼(0.1–100)  GeV, (M2−M1)/M1≪1, focusing on the role of the CP-violation provided by the Dirac phase δ of the Pontecorvo-Maki-Nakagawa-Sakata lepton mixing matrix. We find that viable leptogenesis can be due solely to CP-violating values of δ and that the N1,2 total mixing squared Θ2=∑αΘα2 needed is within the reach of future experiments, Θα parametrizing the coupling to the charged lepton α=e, μ, τ. Furthermore, the required parameter space differs from that associated with additional Casas-Ibarra sources of CP-violation. Future determination of δ, Θ2 and/or the ratios Θτ2∶Θμ2∶Θe2 would provide a critical test of the considered scenario.

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Phys. Rev. D 108, L101302– Published 8 November, 2023
  • Received 18 July 2023
  • Accepted 13 October 2023
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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