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arXiv · 2506.23290

Type II Seesaw Leptogenesis in a Majoron background

Maximilian Berbig
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Abstract

We discuss spontaneous Leptogenesis in the Type II Seesaw model of neutrino masses featuring an electroweak triplet scalar $T$ in a coherent pseudo Nambu-Goldstone boson (pNGB) background. In the "wash-in" scenario the inverse decays of Higgs bosons to $T$ generate a chemical potential for the triplet that is then transmitted to the lepton sector via the leptonic decays of $T$. Our mechanism works with a single triplet that can be as light as 1 TeV, and has a vacuum expectation value $v_T$ in the window $\mathcal{O}(1~\text{keV}) m_j >\mathcal{O}(1~\mu\text{eV})$.

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Maximilian Berbig. 2025-06-29. Type II Seesaw Leptogenesis in a Majoron background. https://doi.org/10.1007/jhep04(2026)116

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