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arXiv · 2509.18276

Probing Quark Electromagnetic Properties via Entangled Quark Pairs in Fragmentation Hadrons at Lepton Colliders

Qing-Hong Cao·Guanghui Li·Xin-Kai Wen·Bin Yan
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Abstract

Electromagnetic dipole interactions of light quarks induce distinct spin correlations in quark pairs produced at lepton colliders, favoring entangled spin-triplet state aligned along the $\hat{z}$ axis or spin-singlet state. These correlations lead to unique $\cos(ϕ_1-ϕ_2)$ azimuthal asymmetries in inclusive $π^+π^-$-dihadron pair production and in back-to-back hadron pairs ($ππ,Kπ,KK$), which are absent in the SM. Using published Belle and BaBar measurements together with projected sensitivities based on ratios of azimuthal asymmetries, we demonstrate that these measurements provide significant constraints on light-quark dipole couplings, with a reduced dependence on poorly known nonperturbative fragmentation functions and free from contamination by other new physics effects. This approach offers a clean and novel probe of light-quark dipole interactions in collider experiments.

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Qing-Hong Cao, Guanghui Li, Xin-Kai Wen, Bin Yan. 2026-08-11. Probing Quark Electromagnetic Properties via Entangled Quark Pairs in Fragmentation Hadrons at Lepton Colliders. https://doi.org/10.1088/1361-6633%2Fae8932

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