Probing Quark Electromagnetic Properties via Entangled Quark Pairs in Fragmentation Hadrons at Lepton Colliders
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916961699495936 |
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| author | Cao, Qing-Hong Li, Guanghui Wen, Xin-Kai Yan, Bin |
| author_facet | Cao, Qing-Hong Li, Guanghui Wen, Xin-Kai Yan, Bin |
| contents | 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. By analyzing Belle and BaBar data and using ratios of azimuthal asymmetries, we demonstrate that these measurements provide robust and significant constraints on light-quark dipole couplings, insensitive to 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_18276 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing Quark Electromagnetic Properties via Entangled Quark Pairs in Fragmentation Hadrons at Lepton Colliders Cao, Qing-Hong Li, Guanghui Wen, Xin-Kai Yan, Bin High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory 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. By analyzing Belle and BaBar data and using ratios of azimuthal asymmetries, we demonstrate that these measurements provide robust and significant constraints on light-quark dipole couplings, insensitive to 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. |
| title | Probing Quark Electromagnetic Properties via Entangled Quark Pairs in Fragmentation Hadrons at Lepton Colliders |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2509.18276 |