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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| Online-Zugang: | https://arxiv.org/abs/2603.26892 |
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| _version_ | 1866917364839219200 |
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| author | Berg, Marcus Haack, Michael Zimmerman, Yonatan |
| author_facet | Berg, Marcus Haack, Michael Zimmerman, Yonatan |
| contents | We calculate field theory loop amplitudes by string methods, applied to half-maximal 4-point one-loop graviton amplitudes. Infrared divergences are regulated similarly to soft-collinear effective field theory (SCET): new mass scales are introduced, here by higher-point kinematics. We use an analytically continued single-valued polylogarithm as generating function. The Feynman integrals for the new tensor structures are infrared finite. We provide code as a step towards automation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_26892 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | One-loop Amplitudes: String Methods, Infrared Regularization, and Automation Berg, Marcus Haack, Michael Zimmerman, Yonatan High Energy Physics - Theory We calculate field theory loop amplitudes by string methods, applied to half-maximal 4-point one-loop graviton amplitudes. Infrared divergences are regulated similarly to soft-collinear effective field theory (SCET): new mass scales are introduced, here by higher-point kinematics. We use an analytically continued single-valued polylogarithm as generating function. The Feynman integrals for the new tensor structures are infrared finite. We provide code as a step towards automation. |
| title | One-loop Amplitudes: String Methods, Infrared Regularization, and Automation |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2603.26892 |