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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.01774 |
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| _version_ | 1866915530719363072 |
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| author | Wang, Guoxing Yang, Li Lin |
| author_facet | Wang, Guoxing Yang, Li Lin |
| contents | The associated production of a photon and a top-antitop quark pair ($t\bar{t}γ$) is important for measuring the top-quark charge and probing the top-photon interaction, and it requires improved theoretical predictions. We focus on the calculation of two-loop amplitudes for $t\bar{t}γ$ production at hadron colliders. The infrared singularities with full top-quark mass dependence are derived from universal anomalous dimensions combined with one-loop massive amplitudes expanded to higher orders in the dimensional regulator $ε$. The finite remainders are approximated in the high-energy boosted limit using the mass-factorization formula. To validate our approach, we compare approximate one-loop amplitudes up to $\mathcal{O}\left(ε^2\right)$, as well as the two-loop infrared poles, against our exact results. The results in this paper serve as an important step toward next-to-next-to-leading order predictions for $t\bar{t}γ$ production. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_01774 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-loop QCD amplitudes for $t\bar{t}γ$ production at hadron colliders Wang, Guoxing Yang, Li Lin High Energy Physics - Phenomenology The associated production of a photon and a top-antitop quark pair ($t\bar{t}γ$) is important for measuring the top-quark charge and probing the top-photon interaction, and it requires improved theoretical predictions. We focus on the calculation of two-loop amplitudes for $t\bar{t}γ$ production at hadron colliders. The infrared singularities with full top-quark mass dependence are derived from universal anomalous dimensions combined with one-loop massive amplitudes expanded to higher orders in the dimensional regulator $ε$. The finite remainders are approximated in the high-energy boosted limit using the mass-factorization formula. To validate our approach, we compare approximate one-loop amplitudes up to $\mathcal{O}\left(ε^2\right)$, as well as the two-loop infrared poles, against our exact results. The results in this paper serve as an important step toward next-to-next-to-leading order predictions for $t\bar{t}γ$ production. |
| title | Two-loop QCD amplitudes for $t\bar{t}γ$ production at hadron colliders |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2510.01774 |