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arXiv · 2601.03740

Topological quantization of vector meson anomalous couplings

Chao-Qiang Geng·Chia-Wei Liu·Yue-Liang Wu
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Abstract

We identify an overlooked Wess--Zumino--Witten structure in the hidden-local-symmetry~(HLS) formulation of vector mesons. The newly identified term generically leads to the topological quantization of the vector-meson anomalous couplings. If confirmed experimentally, this structure would expose the gauge nature of vector mesons in the anomalous sector and single out HLS over matter-field descriptions. The observed success of vector-meson dominance in anomalous interactions can then be explained by topological-action saturation of the odd-intrinsic-parity processes. Precision measurements of $\eta^{(\prime)}\to\pi^+\pi^-\gamma^*$ form factors at BESIII and the Super $\tau$-Charm Facility can directly test this saturation picture.

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Chao-Qiang Geng, Chia-Wei Liu, Yue-Liang Wu. 2026-01-07. Topological quantization of vector meson anomalous couplings. https://arxiv.org/abs/2601.03740

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