Differentiating Dimension-6 and Dimension-8 Effects in $ν$SMEFT at the HL-LHC
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
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2026
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| _version_ | 1866917244004466688 |
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| author | Mitra, Manimala Rahaman, Shakeel Ur Saha, Subham Spannowsky, Michael |
| author_facet | Mitra, Manimala Rahaman, Shakeel Ur Saha, Subham Spannowsky, Michael |
| contents | We study dimension-eight effects in the Standard Model Effective Field Theory extended by right-handed neutrinos ($ν$SMEFT). Using the Hilbert series formalism, we derive the complete basis of dimension-eight operators and confirm agreement with existing classifications, providing a systematic framework beyond the conventional dimension-six truncation. We analyse the collider phenomenology of the representative operator $\mathcal{O}_{N^{2}q^{2}B}^{(1,2)}$ at the High-Luminosity LHC. The resulting signatures involve pair production of right-handed neutrinos in association with jets, followed by decays into electron-jet final states with potentially displaced vertices. Since similar final states are generated by leading dimension-six operators, we explicitly address whether dimension-eight contributions can be experimentally distinguished from dimension-six effects. Using a Boosted Decision Tree analysis based on kinematic observables, we show that the dimension-eight signal can be reliably separated from each relevant dimension-six hypothesis. Our results demonstrate that dimension-eight operators in the $ν$SMEFT can give rise to experimentally resolvable signatures and should be included in collider EFT interpretations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_02720 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Differentiating Dimension-6 and Dimension-8 Effects in $ν$SMEFT at the HL-LHC Mitra, Manimala Rahaman, Shakeel Ur Saha, Subham Spannowsky, Michael High Energy Physics - Phenomenology We study dimension-eight effects in the Standard Model Effective Field Theory extended by right-handed neutrinos ($ν$SMEFT). Using the Hilbert series formalism, we derive the complete basis of dimension-eight operators and confirm agreement with existing classifications, providing a systematic framework beyond the conventional dimension-six truncation. We analyse the collider phenomenology of the representative operator $\mathcal{O}_{N^{2}q^{2}B}^{(1,2)}$ at the High-Luminosity LHC. The resulting signatures involve pair production of right-handed neutrinos in association with jets, followed by decays into electron-jet final states with potentially displaced vertices. Since similar final states are generated by leading dimension-six operators, we explicitly address whether dimension-eight contributions can be experimentally distinguished from dimension-six effects. Using a Boosted Decision Tree analysis based on kinematic observables, we show that the dimension-eight signal can be reliably separated from each relevant dimension-six hypothesis. Our results demonstrate that dimension-eight operators in the $ν$SMEFT can give rise to experimentally resolvable signatures and should be included in collider EFT interpretations. |
| title | Differentiating Dimension-6 and Dimension-8 Effects in $ν$SMEFT at the HL-LHC |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2602.02720 |