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Triplet Higgs field assisted leptogenesis from axion oscillation after inflation

Sasmita Mishra*

  • *Contact author: mishras@nitrkl.ac.in
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Phys. Rev. D 112, 095026 – Published 19 November, 2025

DOI: https://doi.org/10.1103/y6f5-4yxh

Abstract

Leptogenesis via axion oscillation after inflation is an alternate mechanism of thermal leptogenesis. In this mechanism, the requirement of the existence of a lepton number (L) violating process in equilibrium to drive the lepton number requires the temperature of leptogenesis to be at ∼1013  GeV. Triplet scalars, due to their interaction with gauge bosons, make a suitable candidate to prevail in the thermal bath via gauge scattering at such a high energy. Also, owing to its interaction with Standard Model (SM) leptons and the Higgs scalar, it can mediate the ΔL=2 process. Moreover, just one triplet is enough to serve the purpose as opposed to thermal leptogenesis where at least one more triplet scalar/right-handed neutrino is required to generate a sizable CP violation. In this work, we study a model where the SM gauge group is extended with U(1)PQ, with the addition of one Higgs doublet, one scalar triplet, and one complex scalar singlet. The presence of a complex scalar singlet decouples the Peccei-Quinn (PQ) symmetry breaking from the electroweak scale. It also provides a common source of an axionlike particle and seesaw scale. The scalar triplet offers a common link between leptogenesis via axion oscillation and neutrino mass. Further, with the presence of one triplet scalar, the lepton flavor violation process is directly determined from low-energy neutrino oscillation data.

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Phys. Rev. D 112, 095026– Published 19 November, 2025
  • Received 17 June 2025
  • Accepted 17 October 2025
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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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