Probing anomalous hZγ couplings in single Higgs production at future muon colliders
Abstract
Future multi-TeV muon colliders offer an ideal environment to probe physics beyond the Standard Model (SM) through high-precision measurements. In this work, we investigate the sensitivity to anomalous hZγ couplings within the dimension-six Standard Model Effective Field Theory (SMEFT) framework at √s = 3 TeV and 10 TeV muon colliders. Focusing on single Higgs boson production---particularly through vector boson fusion---followed by the rare h → Zγ decay channel, we perform a comprehensive simulation using \textsc{MadGraph5\_aMC@NLO}, \textsc{Pythia}, and \textsc{Delphes} for fast detector response. To maximize signal sensitivity, we contrast a traditional cut-and-count methodology with a multi-bin Boosted Decision Tree (BDT) shape analysis, evaluated within a multi-bin χ2 statistical framework. Our most stringent projections are achieved using the multivariate BDT analysis at 10 TeV. Assuming an integrated luminosity of 10 ab−1 and a 5% systematic uncertainty, we derive expected 95% confidence level intervals of cHW ∈ [−0.005, +0.003] and cHB ∈ [−0.003, +0.005]. Notably, the bound on the cγ coefficient is slightly tighter due to its larger cross-section enhancement, reaching cγ ∈ [−0.002, 0.001]. These results underscore the unique capability of high-energy muon colliders to constrain anomalous Higgs-gauge couplings.
Related
- Probing anomalous Wtb couplings through bW spin correlations in top-quark pair production at the HL-LHC
- Search for anomalous couplings in WW and WZ production with single-lepton final states in proton-proton collisions at √s = 13 TeV
- Probing the Single Production of First-Generation Singlet Vector-like Leptons at Future e+e- Colliders
- Probing Neutral Triple Gauge Couplings at e- p colliders
- Next-to-Leading-Order Multi-Jet Merging of Higgs Boson Production via Vector Boson Fusion in the Presence of Anomalous Couplings
BibTeX
@misc{chenarani2026probing,
title = {{Probing anomalous $hZγ$ couplings in single Higgs production at future muon colliders}},
author = {Shirin Chenarani and Sara Khatibi},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.12023},
eprint = {2609.12023},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.12023},
}
RIS
TY - UNPB
TI - Probing anomalous hZγ couplings in single Higgs production at future muon colliders
AU - Shirin Chenarani
AU - Sara Khatibi
PY - 2026
DA - 2026/09/10
PB - arXiv
DO - 10.48550/arxiv.2609.12023
UR - https://arxiv.org/abs/2609.12023
AB - Future multi-TeV muon colliders offer an ideal environment to probe physics beyond the Standard Model (SM) through high-precision measurements. In this work, we investigate the sensitivity to anomalous hZγ couplings within the dimension-six Standard Model Effective Field Theory (SMEFT) framework at √s = 3 TeV and 10 TeV muon colliders. Focusing on single Higgs boson production---particularly through vector boson fusion---followed by the rare h → Zγ decay channel, we perform a comprehensive simulation using \textsc{MadGraph5\_aMC@NLO}, \textsc{Pythia}, and \textsc{Delphes} for fast detector response. To maximize signal sensitivity, we contrast a traditional cut-and-count methodology with a multi-bin Boosted Decision Tree (BDT) shape analysis, evaluated within a multi-bin χ^2 statistical framework. Our most stringent projections are achieved using the multivariate BDT analysis at 10 TeV. Assuming an integrated luminosity of 10 ab^−1 and a 5% systematic uncertainty, we derive expected 95% confidence level intervals of c_HW ∈ [−0.005, +0.003] and c_HB ∈ [−0.003, +0.005]. Notably, the bound on the c_γ coefficient is slightly tighter due to its larger cross-section enhancement, reaching c_γ ∈ [−0.002, 0.001]. These results underscore the unique capability of high-energy muon colliders to constrain anomalous Higgs-gauge couplings.
ER -