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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.15925 |
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| _version_ | 1866916491512774656 |
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| author | Huang, Yu-tin Paul, Hynek Santagata, Michele |
| author_facet | Huang, Yu-tin Paul, Hynek Santagata, Michele |
| contents | We describe a general formalism based on the partial-wave decomposition to compute the iterative $s$-channel discontinuity of four-point amplitudes at any loop order. As an application, we focus on the low-energy expansions of type I and II superstring amplitudes. Besides providing new results for their leading and sub-leading logarithmic contributions beyond genus one, our approach elucidates the general structure of non-analytic threshold terms. In the case of open strings, the use of orthogonal colour projectors allows us to efficiently compute all contributions from different worldsheet topologies at a given loop order. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_15925 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Non-analytic terms of string amplitudes from partial waves Huang, Yu-tin Paul, Hynek Santagata, Michele High Energy Physics - Theory We describe a general formalism based on the partial-wave decomposition to compute the iterative $s$-channel discontinuity of four-point amplitudes at any loop order. As an application, we focus on the low-energy expansions of type I and II superstring amplitudes. Besides providing new results for their leading and sub-leading logarithmic contributions beyond genus one, our approach elucidates the general structure of non-analytic threshold terms. In the case of open strings, the use of orthogonal colour projectors allows us to efficiently compute all contributions from different worldsheet topologies at a given loop order. |
| title | Non-analytic terms of string amplitudes from partial waves |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2407.15925 |