Strongly-ordered infrared counterterms from factorisation
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866911801155780608 |
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| author | Magnea, Lorenzo Milloy, Calum Signorile-Signorile, Chiara Torrielli, Paolo |
| author_facet | Magnea, Lorenzo Milloy, Calum Signorile-Signorile, Chiara Torrielli, Paolo |
| contents | In the context of infrared subtraction algorithms beyond next-to-leading order, it becomes necessary to consider multiple infrared limits of scattering amplitudes, in which several particles become soft or collinear in a strongly-ordered sequence. We study these limits from the point of view of infrared factorisation, and we provide general definitions of strongly-ordered soft and collinear kernels in terms of gauge-invariant operator matrix elements. With these definitions in hand, it is possible to construct local subtraction counterterms for strongly-ordered configurations. Because of their factorised structure, these counterterms cancel infrared poles of real-virtual contributions by construction. We test these ideas at tree level for multiple emissions, and at one loop for single and double emissions, contributing to NNLO and N3LO distributions, respectively. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_11975 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Strongly-ordered infrared counterterms from factorisation Magnea, Lorenzo Milloy, Calum Signorile-Signorile, Chiara Torrielli, Paolo High Energy Physics - Phenomenology In the context of infrared subtraction algorithms beyond next-to-leading order, it becomes necessary to consider multiple infrared limits of scattering amplitudes, in which several particles become soft or collinear in a strongly-ordered sequence. We study these limits from the point of view of infrared factorisation, and we provide general definitions of strongly-ordered soft and collinear kernels in terms of gauge-invariant operator matrix elements. With these definitions in hand, it is possible to construct local subtraction counterterms for strongly-ordered configurations. Because of their factorised structure, these counterterms cancel infrared poles of real-virtual contributions by construction. We test these ideas at tree level for multiple emissions, and at one loop for single and double emissions, contributing to NNLO and N3LO distributions, respectively. |
| title | Strongly-ordered infrared counterterms from factorisation |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2403.11975 |