Electroweak Triplet Scalar Contribution to SO(10) Leptogenesis

2025/05/09 by Chee Sheng Fong, Fong, Chee Sheng, Ketan M. Patel +1 · 3 citations
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies

paper · pdf · doi:10.48550/arxiv.2505.06391

openalex publication_date 2025/05/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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 10 and 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.

Citations

• GLOBAL ANALYSIS OF NEUTRINO OSCILLATIONS
• Leptogenesis in SO(10) with Minimal Yukawa sector
• Fermion mass, Axion dark matter, and Leptogenesis in SO(10) GUT
• The SO(10)-inspired leptogenesis timely opportunity
• A realistic pattern of fermion masses from a five-dimensional SO(10) model
• Flavour always matters in scalar triplet leptogenesis
• Complex Spinors and Unified Theories
• Leptogenesis with heavy neutrino flavours: from density matrix to Boltzmann equations

Cited by

• One Phase to Rule Them All: Spontaneous CP Violation and Leptogenesis in SO(10)
• Impact of flavour coupling on SO(10)-inspired leptogenesis
• Fermion masses and mixings in supersymmetric SO(10) with third-generation quasi-Yukawa unification

Related

• Leptogenesis with triplet scalars at electroweak scale
• Hybrid Resonant Type-I and Type-II Leptogenesis in SO(10) with Quasi-Degenerate Triplet and Right-Handed Neutrino Masses M_T ≃ M_N3
• Leptogenesis in SO(10) models with a left-right symmetric seesaw mechanism
• Leptogenesis in SO(10) with Minimal Yukawa sector
• Thermal Leptogenesis in SO(10)× U(1)_A SUSY GUT