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arXiv · 2406.02687

Flavor Hierarchies From SU(2) Flavor and Quark-Lepton Unification

Admir Greljo·Anders Eller Thomsen·Hector Tiblom
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Abstract

In our recent attempt to explain flavor hierarchies [1], a gauged SU(2) flavor symmetry acting on left-handed fermions provides a ground to introduce three independent rank-one contributions to the Yukawa matrices: a renormalizable one for the third family, a mass-suppressed one for the second family, and an additional loop-suppressed factor for the first family. Here, we demonstrate how minimal quark-lepton unification \`a la Pati-Salam, relating down-quarks to charged leptons, can significantly improve this mechanism. We construct and thoroughly analyze a renormalizable model, performing a comprehensive one-loop matching calculation that reveals how all flavor hierarchies emerge from a single ratio of two scales. The first signatures may appear in the upcoming charged lepton flavor violation experiments.

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Admir Greljo, Anders Eller Thomsen, Hector Tiblom. 2024-06-04. Flavor Hierarchies From SU(2) Flavor and Quark-Lepton Unification. https://arxiv.org/abs/2406.02687

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