1. Small Neutrino Masses from a Decoupled Singlet Scalar Field
- Author
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Kim, Jongkuk, Kim, Seong-Sik, Lee, Hyun Min, and Padhan, Rojalin
- Subjects
High Energy Physics - Phenomenology - Abstract
We propose a unified solution with $Z_4$ discrete symmetry for small neutrino masses and stability of dark matter. Our model consists of an inert doublet scalar, a dark singlet scalar $S$, a spurion scalar $\varphi$ and right-handed neutrinos beyond the Standard Model (SM), which transform nontrivially under $Z_4$. Once the $Z_4$ symmetry is broken to $Z_2$ by the VEV of $\varphi$, much below the mass scale of the singlet scalar $S$, a small quartic coupling between SM Higgs and inert doublets, which violates both $Z_4$ and lepton number, is generated at tree level, so small neutrino masses are obtained at one-loops. We discuss the consistent parameter space for neutrino masses, direct detection and thermal leptogenesis in the model., Comment: 6+4 pages, 4 figures
- Published
- 2024