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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2503.17663 |
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| _version_ | 1866913751577395200 |
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| author | Li, Guanghui Li, Xu Yan, Bin |
| author_facet | Li, Guanghui Li, Xu Yan, Bin |
| contents | The breaking of the Lam-Tung relation in the Drell-Yan process at the LHC exhibits a long-standing tension with the Standard Model (SM) prediction at $\mathcal{O}(α_s^3)$ accuracy. This tension could be explained by weak dipole interactions of leptons and quarks, associated with the $Z$-boson within the framework of the Standard Model Effective Field Theory (SMEFT). In this paper, we propose to cross-check these weak dipole interactions by measuring the violation effects of the Lam-Tung relation at future lepton colliders through the processes $e^+e^- \to Zγ\to \ell\bar{\ell}γ$ and $e^+e^- \to Zγ\to q\bar{q}γ$. By considering different decay modes of the $Z$-boson, these channels exhibit distinct sensitivities to various dipole operators, providing a way to disentangle their individual effects. Additionally, the high flavor-tagging efficiencies at lepton colliders could provide strong constraints on the dipole interactions of heavy quarks, such as $b$ and $c$ quarks, which are challenging to probe in the Drell-Yan process at the LHC due to the suppression of parton distribution functions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_17663 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Lam-Tung relation breaking effects and weak dipole moments at lepton colliders Li, Guanghui Li, Xu Yan, Bin High Energy Physics - Phenomenology High Energy Physics - Experiment The breaking of the Lam-Tung relation in the Drell-Yan process at the LHC exhibits a long-standing tension with the Standard Model (SM) prediction at $\mathcal{O}(α_s^3)$ accuracy. This tension could be explained by weak dipole interactions of leptons and quarks, associated with the $Z$-boson within the framework of the Standard Model Effective Field Theory (SMEFT). In this paper, we propose to cross-check these weak dipole interactions by measuring the violation effects of the Lam-Tung relation at future lepton colliders through the processes $e^+e^- \to Zγ\to \ell\bar{\ell}γ$ and $e^+e^- \to Zγ\to q\bar{q}γ$. By considering different decay modes of the $Z$-boson, these channels exhibit distinct sensitivities to various dipole operators, providing a way to disentangle their individual effects. Additionally, the high flavor-tagging efficiencies at lepton colliders could provide strong constraints on the dipole interactions of heavy quarks, such as $b$ and $c$ quarks, which are challenging to probe in the Drell-Yan process at the LHC due to the suppression of parton distribution functions. |
| title | Lam-Tung relation breaking effects and weak dipole moments at lepton colliders |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2503.17663 |