Implications of portal vector-like lepton on associated Higgs production at a multi-TeV muon collider
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866917130505551872 |
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| author | Tewary, Krishna Biswas, Sanjoy Verma, Shivam |
| author_facet | Tewary, Krishna Biswas, Sanjoy Verma, Shivam |
| contents | We have explored a portal vector-like lepton (pVLL) extension of the Standard Model (SM) and studied its implications for Higgs and vector-boson associated production ($hV$, with $~V = Z$-boson or dark photon) at a future muon collider facility. We show that while the $~μ^+ μ^- \to hZ~$ production rate remains close to its SM prediction in a wide range of parameter space, the rate for $~μ^+ μ^- \to hγ_d~$ can be substantially enhanced owing to the non-decoupling nature of the interaction involving the heavy lepton, the muon and the dark photon. We demonstrate that the $hγ_d$ production rate can exceed the corresponding $hZ$ rate by a factor of $1$-$100$ within the perturbative unitarity limit, making it a promising channel for probing Higgs interactions and potential new physics effects.
Furthermore, this process can also be used to constrain the dark photon mass ($m_{γ_d}$) and/or the dark gauge coupling ($g_d$) consistent with the current muon $g-2$ measurements within the pVLL framework. We perform a detailed collider analysis of the $hγ_d$ process in the $b\bar{b}~+$ missing energy final state. A $2σ$ exclusion limit for $m_{γ_d}$ up to $80$ GeV is obtained assuming $~g_d=0.05$, $~\sinθ_L=4\times10^{-5}$, $~\sinθ_s=0.05$, for a heavy lepton mass $~\sim 3$ TeV at a $3$ TeV muon collider with an integrated luminosity of $1$ ab$^{-1}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_00578 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Implications of portal vector-like lepton on associated Higgs production at a multi-TeV muon collider Tewary, Krishna Biswas, Sanjoy Verma, Shivam High Energy Physics - Phenomenology High Energy Physics - Experiment We have explored a portal vector-like lepton (pVLL) extension of the Standard Model (SM) and studied its implications for Higgs and vector-boson associated production ($hV$, with $~V = Z$-boson or dark photon) at a future muon collider facility. We show that while the $~μ^+ μ^- \to hZ~$ production rate remains close to its SM prediction in a wide range of parameter space, the rate for $~μ^+ μ^- \to hγ_d~$ can be substantially enhanced owing to the non-decoupling nature of the interaction involving the heavy lepton, the muon and the dark photon. We demonstrate that the $hγ_d$ production rate can exceed the corresponding $hZ$ rate by a factor of $1$-$100$ within the perturbative unitarity limit, making it a promising channel for probing Higgs interactions and potential new physics effects. Furthermore, this process can also be used to constrain the dark photon mass ($m_{γ_d}$) and/or the dark gauge coupling ($g_d$) consistent with the current muon $g-2$ measurements within the pVLL framework. We perform a detailed collider analysis of the $hγ_d$ process in the $b\bar{b}~+$ missing energy final state. A $2σ$ exclusion limit for $m_{γ_d}$ up to $80$ GeV is obtained assuming $~g_d=0.05$, $~\sinθ_L=4\times10^{-5}$, $~\sinθ_s=0.05$, for a heavy lepton mass $~\sim 3$ TeV at a $3$ TeV muon collider with an integrated luminosity of $1$ ab$^{-1}$. |
| title | Implications of portal vector-like lepton on associated Higgs production at a multi-TeV muon collider |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2511.00578 |