2025/06/03 by Pramod Sharma, Sharma, Pramod, Ambresh Shivaji +1 · 1 citation
Engineering · Physics and Astronomy · #Advanced X-ray Imaging Techniques #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle Accelerators and Free-Electron Lasers #Particle Detector Development and Performance
paper · pdf · doi:10.48550/arxiv.2506.02558
openalex publication_date 2025/06/03 · openalex created_date 2025/10/14 · openalex updated_date 2026/07/28
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 → e- H j at the center of mass energy √(s)~≈ 1.3 TeV. The most general Lorentz structure of the HZZ coupling beyond the standard model is composed of two CP-even (λ1Z and λ2Z) and one CP-odd ( λZ) 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 → νe H j process. Since the process e- p → 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 λ2Z and λZ 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.