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Leptogenesis and neutrino masses via pseudo-Dirac gauginos

Cem Murat Ayber1,*, Tammi Chowdhury2,†, and Seyda Ipek1,‡

  • *Contact author: cemayber@cmail.carleton.ca
  • †Contact author: chowdh64@myumanitoba.ca
  • ‡Contact author: Seyda.Ipek@carleton.ca
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Phys. Rev. D 113, 115046 – Published 17 June, 2026

DOI: https://doi.org/10.1103/6hrv-hb9x

Abstract

In a U(1)R−L-symmetric supersymmetric model, pseudo-Dirac bino and wino can act like right-handed neutrinos, generating the light neutrino masses through a hybrid type I + III inverse seesaw mechanism. We investigate such a model to accommodate the baryon asymmetry of the universe together with neutrino masses. A pseudo-Dirac gaugino goes under particle-antiparticle oscillations. Possible CP violation in bino decays, induced by mixing with the neutrinos, can be enhanced in bino–antibino oscillations. Focusing on a long-lived bino, we show that its oscillations and decays can generate the observed baryon asymmetry while the wino is responsible for generating the neutrino masses. This mechanism requires a decoupled mass spectrum with a bino of mass MB˜∼O(TeV) and sfermions with mass Msf≳50  TeV. Furthermore, for the bino to decay out-of-equilibrium before the electroweak sphalerons turn off, the messenger scale needs to be ΛM∼O(107  TeV). We discuss the displaced vertex signals at the LHC resulting from such a high messenger scale.

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Phys. Rev. D 113, 115046– Published 17 June, 2026
  • Received 21 March 2025
  • Accepted 26 May 2026
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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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