Probing Scalar-Mediated Sterile Neutrinos with Gravitational Wave and Colliders Signals
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866918149995102208 |
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| author | Bi, Qi Guo, Jinhui Liao, Jian Liu, Jia Wang, Xiao-Ping |
| author_facet | Bi, Qi Guo, Jinhui Liao, Jian Liu, Jia Wang, Xiao-Ping |
| contents | We propose a UV-complete extension of the Standard Model in which a gauge-singlet scalar $S$ acquires a vacuum expectation value, generates a Majorana mass for a sterile neutrino $N$, and mixes with the Higgs field. This framework addresses neutrino masses via a seesaw mechanism and, for sufficiently large scalar mixing, can also drive a strong first-order electroweak phase transition, producing gravitational-wave (GW) signals potentially detectable by GW observatories. The Higgs-$S$ mixing also enhances sterile-neutrino pair production at colliders through $s$-channel exchange of the Higgs and $S$. Owing to the small active-sterile mixing angle, $N$ is generically long-lived, yielding characteristic displaced-vertex signatures. The combination of GW observations and displaced-vertex searches at colliders provides complementary cross-checks of the model parameter space. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_23925 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing Scalar-Mediated Sterile Neutrinos with Gravitational Wave and Colliders Signals Bi, Qi Guo, Jinhui Liao, Jian Liu, Jia Wang, Xiao-Ping High Energy Physics - Phenomenology We propose a UV-complete extension of the Standard Model in which a gauge-singlet scalar $S$ acquires a vacuum expectation value, generates a Majorana mass for a sterile neutrino $N$, and mixes with the Higgs field. This framework addresses neutrino masses via a seesaw mechanism and, for sufficiently large scalar mixing, can also drive a strong first-order electroweak phase transition, producing gravitational-wave (GW) signals potentially detectable by GW observatories. The Higgs-$S$ mixing also enhances sterile-neutrino pair production at colliders through $s$-channel exchange of the Higgs and $S$. Owing to the small active-sterile mixing angle, $N$ is generically long-lived, yielding characteristic displaced-vertex signatures. The combination of GW observations and displaced-vertex searches at colliders provides complementary cross-checks of the model parameter space. |
| title | Probing Scalar-Mediated Sterile Neutrinos with Gravitational Wave and Colliders Signals |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2509.23925 |