Electroweak Triplet Scalar Contribution to $SO(10)$ Leptogenesis
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| Format: | Preprint |
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2025
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| _version_ | 1866913829403754496 |
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| author | Fong, Chee Sheng Patel, Ketan M. |
| author_facet | Fong, Chee Sheng Patel, Ketan M. |
| contents | We show that electroweak triplet scalar can significantly impact baryogenesis via leptogenesis in concrete and predictive $SO(10)$ GUTs, even when light neutrino masses arise predominantly from the type-I seesaw mechanism. This is illustrated within a minimal renormalisable $SO(10)$ model with $\mathbf{10}$ and $\overline{\mathbf{126}}$ scalars in the Yukawa sector and a global Peccei-Quinn-like symmetry. The quark-lepton unification and the flavour structure of the fundamental Yukawa couplings enforce type-I dominance in the light neutrino masses, also suppressing the triplet-induced CP asymmetries in the right-handed neutrino decays. However, the triplet's own decays introduce a new CP-violating source, which can enhance or suppress the total baryon asymmetry. For triplet mass near the right-handed neutrino mass scale, this contribution can dominate, making it essential in assessing the viability of $SO(10)$ leptogenesis scenarios. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_06391 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electroweak Triplet Scalar Contribution to $SO(10)$ Leptogenesis Fong, Chee Sheng Patel, Ketan M. High Energy Physics - Phenomenology We show that electroweak triplet scalar can significantly impact baryogenesis via leptogenesis in concrete and predictive $SO(10)$ GUTs, even when light neutrino masses arise predominantly from the type-I seesaw mechanism. This is illustrated within a minimal renormalisable $SO(10)$ model with $\mathbf{10}$ and $\overline{\mathbf{126}}$ scalars in the Yukawa sector and a global Peccei-Quinn-like symmetry. The quark-lepton unification and the flavour structure of the fundamental Yukawa couplings enforce type-I dominance in the light neutrino masses, also suppressing the triplet-induced CP asymmetries in the right-handed neutrino decays. However, the triplet's own decays introduce a new CP-violating source, which can enhance or suppress the total baryon asymmetry. For triplet mass near the right-handed neutrino mass scale, this contribution can dominate, making it essential in assessing the viability of $SO(10)$ leptogenesis scenarios. |
| title | Electroweak Triplet Scalar Contribution to $SO(10)$ Leptogenesis |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2505.06391 |