Novel Signatures of Heavy Neutral Lepton at Muon Collider
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arXiv
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2026
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| _version_ | 1866912879208300544 |
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| author | Zhang, Xue-Xin Han, Zhi-Long Huang, Fei Li, Honglei |
| author_facet | Zhang, Xue-Xin Han, Zhi-Long Huang, Fei Li, Honglei |
| contents | The Higgs-strahlung process $\ell^+\ell^-\to Z h$ is one of the most important production channels of the standard model Higgs boson $h$ at the lepton colliders. The cross section reaches the maximum value slightly above the threshold $\sqrt{s}\sim m_Z+m_h$, and decreases as $\sim 1/s$ at high energies. In the gauged extension models, the new gauge boson $Z'$ and heavy Higgs boson $H$ exist after the symmetry breaking. The heavy Higgs-strahlung process $\ell^+\ell^-\to Z' H$ would also reach the maximum cross section around the threshold $\sqrt{s}\sim m_{Z'}+m_H$. Therefore, the future high energy lepton colliders, such as the TeV scale muon collider, are promising to probe this new process. If heavy neutral lepton $N$ is introduced to generate the tiny neutrino masses via seesaw mechanism, novel signatures could arise from $μ^+μ^-\to Z' H \to NN +NN \to 4 μ^\pm +4J$ and $μ^+μ^-\to Z' H \to μ^+μ^- +NN \to 3 μ^\pm μ^\mp +2J$, where the fat-jets $J$ come from the hadronic decay of $W$ bosons. In this paper, we investigate the same-sign tetralepton signature $4μ^\pm+4J$ and the same-sign trilepton signature $3μ^\pm μ^\mp + 2J$ at the 3 TeV and 10 TeV muon collider. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_05158 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Novel Signatures of Heavy Neutral Lepton at Muon Collider Zhang, Xue-Xin Han, Zhi-Long Huang, Fei Li, Honglei High Energy Physics - Phenomenology High Energy Physics - Experiment The Higgs-strahlung process $\ell^+\ell^-\to Z h$ is one of the most important production channels of the standard model Higgs boson $h$ at the lepton colliders. The cross section reaches the maximum value slightly above the threshold $\sqrt{s}\sim m_Z+m_h$, and decreases as $\sim 1/s$ at high energies. In the gauged extension models, the new gauge boson $Z'$ and heavy Higgs boson $H$ exist after the symmetry breaking. The heavy Higgs-strahlung process $\ell^+\ell^-\to Z' H$ would also reach the maximum cross section around the threshold $\sqrt{s}\sim m_{Z'}+m_H$. Therefore, the future high energy lepton colliders, such as the TeV scale muon collider, are promising to probe this new process. If heavy neutral lepton $N$ is introduced to generate the tiny neutrino masses via seesaw mechanism, novel signatures could arise from $μ^+μ^-\to Z' H \to NN +NN \to 4 μ^\pm +4J$ and $μ^+μ^-\to Z' H \to μ^+μ^- +NN \to 3 μ^\pm μ^\mp +2J$, where the fat-jets $J$ come from the hadronic decay of $W$ bosons. In this paper, we investigate the same-sign tetralepton signature $4μ^\pm+4J$ and the same-sign trilepton signature $3μ^\pm μ^\mp + 2J$ at the 3 TeV and 10 TeV muon collider. |
| title | Novel Signatures of Heavy Neutral Lepton at Muon Collider |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2602.05158 |