Testing Non-Standard Neutrinos in Purely Leptonic Lepton Decays
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866914322637127680 |
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| author | Zhang, Han Ke, Bai-Cian Yu, Yao |
| author_facet | Zhang, Han Ke, Bai-Cian Yu, Yao |
| contents | We propose a method to probe sterile neutrinos using polarization observables in the purely leptonic decays $\ell^{\prime-} \to \ell^{-} \barν_{\ell} ν_{\ell^{\prime}}$. By analyzing angular distributions and asymmetries derived from polarized decay rates, we identify distinctive signatures of sterile neutrino mixing. In particular, we demonstrate that sterile neutrinos can induce singularities in certain asymmetry parameters as functions of the invariant mass squared of the neutrino pair. These singularities occur for sterile neutrino masses $m_{4ν}$ satisfying $m_{4ν}^2 < m_{\ell^{\prime}}^2 / 2$, providing a clear target for experimental investigation. Our results motivate the incorporation of polarized beam sources at future colliders to enhance sensitivity to sterile neutrinos and other new physics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_21374 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Testing Non-Standard Neutrinos in Purely Leptonic Lepton Decays Zhang, Han Ke, Bai-Cian Yu, Yao High Energy Physics - Phenomenology High Energy Physics - Experiment We propose a method to probe sterile neutrinos using polarization observables in the purely leptonic decays $\ell^{\prime-} \to \ell^{-} \barν_{\ell} ν_{\ell^{\prime}}$. By analyzing angular distributions and asymmetries derived from polarized decay rates, we identify distinctive signatures of sterile neutrino mixing. In particular, we demonstrate that sterile neutrinos can induce singularities in certain asymmetry parameters as functions of the invariant mass squared of the neutrino pair. These singularities occur for sterile neutrino masses $m_{4ν}$ satisfying $m_{4ν}^2 < m_{\ell^{\prime}}^2 / 2$, providing a clear target for experimental investigation. Our results motivate the incorporation of polarized beam sources at future colliders to enhance sensitivity to sterile neutrinos and other new physics. |
| title | Testing Non-Standard Neutrinos in Purely Leptonic Lepton Decays |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2508.21374 |