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arXiv · 2603.00864

Yukawa Textures with Enhanced Symmetries in Heterotic Calabi-Yau Compactifications

Jun Dong·Tatsuo Kobayashi·Shuhei Miyamoto·Hajime Otsuka
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Abstract

We clarify the structure of Yukawa couplings and mass matrices for matter fields in heterotic string theory on smooth Calabi-Yau threefolds with standard embedding. The topological structure of Calabi-Yau threefolds leads to interesting Yukawa textures that cannot be derived from group-theoretical symmetries, e.g., the so-called Weinberg texture in the case of two generations of matter fields. Furthermore, we find that a $U(2)$ flavor symmetry, which plays an important role in controlling higher-dimensional operators in the Standard Model effective field theory, emerges at specific loci in the moduli space of multi-Higgs fields. Small perturbations around these loci generate semi-realistic patterns of quark masses and mixings.

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Jun Dong, Tatsuo Kobayashi, Shuhei Miyamoto, Hajime Otsuka. 2026-03-01. Yukawa Textures with Enhanced Symmetries in Heterotic Calabi-Yau Compactifications. https://arxiv.org/abs/2603.00864

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