Unitarity bounds and sum rules in the SMEFT
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866915832844517376 |
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| author | Bresciani, Luigi C. Paradisi, Paride Sainaghi, Andrea |
| author_facet | Bresciani, Luigi C. Paradisi, Paride Sainaghi, Andrea |
| contents | We present a comprehensive reassessment of perturbative unitarity bounds in the dimension-six Standard Model Effective Field Theory, exploiting a new formalism based on spinor-helicity techniques to derive partial-wave unitarity bounds for generic $N \to M$ scattering amplitudes. We find that, in several cases, these theoretical constraints are already competitive with, or even stronger than, the corresponding experimental bounds for energy scales above a few TeV. This is especially the case for four-fermion operators under realistic flavor assumptions, where unitarity bounds can be further strengthened by exploiting sum rules. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_03423 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Unitarity bounds and sum rules in the SMEFT Bresciani, Luigi C. Paradisi, Paride Sainaghi, Andrea High Energy Physics - Phenomenology We present a comprehensive reassessment of perturbative unitarity bounds in the dimension-six Standard Model Effective Field Theory, exploiting a new formalism based on spinor-helicity techniques to derive partial-wave unitarity bounds for generic $N \to M$ scattering amplitudes. We find that, in several cases, these theoretical constraints are already competitive with, or even stronger than, the corresponding experimental bounds for energy scales above a few TeV. This is especially the case for four-fermion operators under realistic flavor assumptions, where unitarity bounds can be further strengthened by exploiting sum rules. |
| title | Unitarity bounds and sum rules in the SMEFT |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2603.03423 |