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arXiv · 2503.11136

Origin of CKM matrix and natural FCNC suppression in gauge-Higgs unification

Yutaka Hosotani·Shuichiro Funatsu·Hisaki Hatanaka·Yuta Orikasa·Naoki Yamatsu
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Abstract

In the $SO(5) \times U(1) \times SU(3)$ gauge-Higgs unification in the Randall-Sundrum warped space the mixing in the $W$ couplings in the quark sector is induced by masses of $SO(5)$ singlet fermions which are responsible for splitting masses of down-type quarks from those of up-type quarks in each generation. We show that the observed Cabibbo-Kobayashi-Maskawa (CKM) matrix in the $W$ couplings is reproduced within experimental errors. Further flavor-changing neutral currents (FCNCs) in the quark sector are shown to be naturally suppressed.

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Yutaka Hosotani, Shuichiro Funatsu, Hisaki Hatanaka, Yuta Orikasa, Naoki Yamatsu. 2025-03-14. Origin of CKM matrix and natural FCNC suppression in gauge-Higgs unification. https://arxiv.org/abs/2503.11136

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