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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2501.07618 |
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| _version_ | 1866915289418956800 |
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| author | Duarte, Lucía Maisian, Daniel Chalençon Urruzola, Tomás |
| author_facet | Duarte, Lucía Maisian, Daniel Chalençon Urruzola, Tomás |
| contents | The discovery of neutrino oscillations and masses provides strong motivation to extend the Standard Model by including right-handed neutrinos, which lead to heavy neutrino states that could exist at the electroweak scale. These states may also be influenced by new high-scale, weakly interacting physics. Incorporating right-handed neutrinos into an effective field theory framework -- the $ν$SMEFT -- offers a systematic approach to study the phenomenology of heavy neutrinos in current and upcoming experiments. In this work, we present the first prospective 95\% exclusion plots achievable at a future lepton collider operating at a center-of-mass energy of $\sqrt{s}=0.5 ~\rm{TeV}$ for what we term the agnostic $ν$SMEFT scenario. This study focuses on the high-mass regime where the heavy neutrino $N$ decays promptly into leptons and jets. Specifically, we analyze the processes $e^+e^- \to νN \to νμ^{-} μ^{+} ν$ and $e^+e^- \to νN \to νμ^{-} \mathrm{j} \mathrm{j}$, deriving the exclusion regions in the $\fracα{Λ^2}$ vs. $m_N$ parameter space. When compared to prospective limits for the LHeC, we find that the semi-leptonic process with final jets in a lepton collider offers the greatest sensitivity, even with a straightforward cut-based analysis. The expected bounds are as stringent as those considered in recent studies for the low-mass regime where the $N$ may be long-lived and detectable via displaced decay searches, both at the LHC and future colliders. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_07618 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Future collider sensitivities to $ν$SMEFT interactions Duarte, Lucía Maisian, Daniel Chalençon Urruzola, Tomás High Energy Physics - Phenomenology The discovery of neutrino oscillations and masses provides strong motivation to extend the Standard Model by including right-handed neutrinos, which lead to heavy neutrino states that could exist at the electroweak scale. These states may also be influenced by new high-scale, weakly interacting physics. Incorporating right-handed neutrinos into an effective field theory framework -- the $ν$SMEFT -- offers a systematic approach to study the phenomenology of heavy neutrinos in current and upcoming experiments. In this work, we present the first prospective 95\% exclusion plots achievable at a future lepton collider operating at a center-of-mass energy of $\sqrt{s}=0.5 ~\rm{TeV}$ for what we term the agnostic $ν$SMEFT scenario. This study focuses on the high-mass regime where the heavy neutrino $N$ decays promptly into leptons and jets. Specifically, we analyze the processes $e^+e^- \to νN \to νμ^{-} μ^{+} ν$ and $e^+e^- \to νN \to νμ^{-} \mathrm{j} \mathrm{j}$, deriving the exclusion regions in the $\fracα{Λ^2}$ vs. $m_N$ parameter space. When compared to prospective limits for the LHeC, we find that the semi-leptonic process with final jets in a lepton collider offers the greatest sensitivity, even with a straightforward cut-based analysis. The expected bounds are as stringent as those considered in recent studies for the low-mass regime where the $N$ may be long-lived and detectable via displaced decay searches, both at the LHC and future colliders. |
| title | Future collider sensitivities to $ν$SMEFT interactions |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2501.07618 |