The effects of Higgs boson couplings through HZZ production at future lepton colliders

Abstract

We focus on the sensitivity of the anomalous Higgs-gauge boson couplings at $H\gamma Z$ and $HZZ$ vertices through the process ${\ell }^{-}{\ell }^{+}\to HZZ$ at CLIC and Muon Collider. Signal and relevant backgrounds events are generated in MadGraph within Standard Model Effective Field Theory (SMEFT) framework. These events are passed through Pythia for parton showering, and realistic detector effects are simulated by Delphes. The limits at 95% C.L. on the coefficients ${\overline{c}}_{HB}$ and ${\overline{c}}_{HW}$ are obtained at two b-tagging working points; loose and medium containing the Delphes card from CLIC and Muon Collider, corresponding to b-tagging efficiencies of 90% and 70%, respectively. We report that our best 95% C.L. limits on ${\overline{c}}_{HB}$ and ${\overline{c}}_{HW}$ coefficients are $[-0.00138;0.00090]$ and $[-0.00162;0.00026]$, respectively, at 3 TeV CLIC with an integrated luminosity of 5 ab${}^{-1}$, and $[-0.00024;0.00023]$ and $[-0.00020;0.00009]$, respectively, at 10 TeV Muon Collider with an integrated luminosity of 10 ab${}^{-1}$. These limits are compared with the present experimental and various phenomenological limits.

28 pages, 12 figures

References in corpus (10)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Electroweak Couplings of the Higgs Boson at a Multi-TeV Muon Collider
• Constraining Higgs boson effective couplings at electron-positron colliders
• Measurement of Higgs boson self-couplings through $2\to 3$ vector bosons scattering in future muon colliders
• Measuring Higgs self couplings in the presence of VVH and VVHH at the ILC
• Measuring Higgs Boson Self-couplings with $2\to 3$ VBS Processes
• Study on the sensitivity of the Higgs boson couplings in photon-photon collision at CLIC and muon collider
• Constraints on the anomalous Higgs boson couplings in $Z\gamma \gamma$ production at muon collider