Linearly Polarized Photon Fusion as a Precision Probe of the Tau Lepton Dipole Moments at Lepton Colliders
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866914335765299200 |
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| author | Shao, Ding Yu Xiang, Hao Xu, Fang Yan, Bin Zhang, Cheng |
| author_facet | Shao, Ding Yu Xiang, Hao Xu, Fang Yan, Bin Zhang, Cheng |
| contents | We present a comprehensive investigation into the anomalous magnetic dipole moment ($a_τ$) and electric dipole moment ($d_τ$) of the $τ$ lepton using the $γγ\to τ^+τ^-$ process at future lepton colliders, with the Super Tau-Charm Facility serving as a benchmark. By employing transverse-momentum-dependent factorization, we introduce novel observables derived from $\cos2ϕ$, $\sin2ϕ$, and $\cos4ϕ$ azimuthal asymmetries to precisely probe the $τ$ lepton's electromagnetic structure. Our analysis significantly enhances the precision of $a_τ$ constraints within the photon-photon fusion process, yielding $\mathrm{Re}(a_τ) \in [-4.6, 7.0] \times 10^{-3}$ at the $2σ$ confidence level, which approaches the precision of the Standard Model prediction. These findings highlight the considerable potential of azimuthal asymmetry measurements for high-precision determinations of fundamental particle properties at future lepton colliders. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_15245 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Linearly Polarized Photon Fusion as a Precision Probe of the Tau Lepton Dipole Moments at Lepton Colliders Shao, Ding Yu Xiang, Hao Xu, Fang Yan, Bin Zhang, Cheng High Energy Physics - Phenomenology High Energy Physics - Experiment We present a comprehensive investigation into the anomalous magnetic dipole moment ($a_τ$) and electric dipole moment ($d_τ$) of the $τ$ lepton using the $γγ\to τ^+τ^-$ process at future lepton colliders, with the Super Tau-Charm Facility serving as a benchmark. By employing transverse-momentum-dependent factorization, we introduce novel observables derived from $\cos2ϕ$, $\sin2ϕ$, and $\cos4ϕ$ azimuthal asymmetries to precisely probe the $τ$ lepton's electromagnetic structure. Our analysis significantly enhances the precision of $a_τ$ constraints within the photon-photon fusion process, yielding $\mathrm{Re}(a_τ) \in [-4.6, 7.0] \times 10^{-3}$ at the $2σ$ confidence level, which approaches the precision of the Standard Model prediction. These findings highlight the considerable potential of azimuthal asymmetry measurements for high-precision determinations of fundamental particle properties at future lepton colliders. |
| title | Linearly Polarized Photon Fusion as a Precision Probe of the Tau Lepton Dipole Moments at Lepton Colliders |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2506.15245 |