Role of angular observables in probing non-standard $HZZ$ couplings at an electron-proton collider
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915320755650560 |
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| author | Sharma, Pramod Shivaji, Ambresh |
| author_facet | Sharma, Pramod Shivaji, Ambresh |
| contents | In this study, we explore various lab-frame angular observables at Large Hadron-electron Collider (LHeC) to test their sensitivity on the most general structure of the Higgs ($H$) to neutral weak boson ($Z$) coupling ($HZZ$) via the process $e^- p \rightarrow e^- H j$ at the center of mass energy $\sqrt{s}~\approx$ 1.3 TeV. The most general Lorentz structure of the $HZZ$ coupling beyond the standard model is composed of two CP-even ($λ_{1Z}$ and $λ_{2Z}$) and one CP-odd (${\tilde λ_Z}$) components. In a previous study, we looked at the absolute value of azimuthal correlation ($|Δϕ|$) between the final state electron and the jet to derive constraints on the non-standard $HZZ$ couplings. This choice of observable is motivated by its potential to discriminate between CP-odd and CP-even couplings in the $e^- p \rightarrow ν_e H j$ process. Since the process $e^- p \rightarrow e^- H j$ has an electron in the final state, one can construct more angular observables. In addition to $|Δϕ|$, we identify new angular observables: the sign-sensitive azimuthal correlation ($Δϕ$) and the polar angle of the final state electron ($θ$), suitable for constraining non-standard $HZZ$ coupling. Our analysis shows that these new angles improve the constraints on $λ_{2Z}$ and ${\tilde λ}_Z$ in the range of 48-67\%. We also study the potential of the asymmetry in $Δϕ$ to constrain the parameters corresponding to the CP-odd coupling. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_02558 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Role of angular observables in probing non-standard $HZZ$ couplings at an electron-proton collider Sharma, Pramod Shivaji, Ambresh High Energy Physics - Phenomenology In this study, we explore various lab-frame angular observables at Large Hadron-electron Collider (LHeC) to test their sensitivity on the most general structure of the Higgs ($H$) to neutral weak boson ($Z$) coupling ($HZZ$) via the process $e^- p \rightarrow e^- H j$ at the center of mass energy $\sqrt{s}~\approx$ 1.3 TeV. The most general Lorentz structure of the $HZZ$ coupling beyond the standard model is composed of two CP-even ($λ_{1Z}$ and $λ_{2Z}$) and one CP-odd (${\tilde λ_Z}$) components. In a previous study, we looked at the absolute value of azimuthal correlation ($|Δϕ|$) between the final state electron and the jet to derive constraints on the non-standard $HZZ$ couplings. This choice of observable is motivated by its potential to discriminate between CP-odd and CP-even couplings in the $e^- p \rightarrow ν_e H j$ process. Since the process $e^- p \rightarrow e^- H j$ has an electron in the final state, one can construct more angular observables. In addition to $|Δϕ|$, we identify new angular observables: the sign-sensitive azimuthal correlation ($Δϕ$) and the polar angle of the final state electron ($θ$), suitable for constraining non-standard $HZZ$ coupling. Our analysis shows that these new angles improve the constraints on $λ_{2Z}$ and ${\tilde λ}_Z$ in the range of 48-67\%. We also study the potential of the asymmetry in $Δϕ$ to constrain the parameters corresponding to the CP-odd coupling. |
| title | Role of angular observables in probing non-standard $HZZ$ couplings at an electron-proton collider |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2506.02558 |