Possibility of Probing an Extra Higgs Boson at the Compact Linear Collider

Abstract

We study the sensitivity of the Compact Linear Collider (CLIC) to an additional neutral Higgs boson $H$ through the vector boson fusion process $e^{+}{e}^{-}\to H\nu \bar{\nu }$, followed by the decay $H\to W^{+}{W}^{-}$, with both $W$ bosons decaying leptonically, resulting in a dilepton plus missing transverse energy final state. Within the framework of the Two Higgs Doublet Model, where both production and decay are governed by the Higgs mixing angle $\cos (\beta -\alpha )$, we perform a detector-level analysis and show that a high-energy CLIC can probe $H$ via this channel, allowing a direct measurement of the $HWW$ coupling.

arXiv comment10 pages, 4 figures; contribution to the proceedings of the International Workshop on Future Linear Colliders (LCWS2025), 20-24 October 2025, Valencia, Spain; published in The European Physical Journal Plus

References in corpus (22)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Asymptotic formulae for likelihood-based tests of new physics
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• Theory and phenomenology of two-Higgs-doublet models
• HiggsTools: BSM scalar phenomenology with new versions of HiggsBounds and HiggsSignals
• Higgs Physics at the CLIC Electron-Positron Linear Collider
• Search for charged Higgs bosons decaying into a top quark and a bottom quark at $\sqrt{s}$=13 TeV with the ATLAS detector
• When the Higgs meets the Top: Search for t --> ch^0 at the LHC
• Electroweak Baryogenesis driven by Extra Top Yukawa Couplings
• New LHC Benchmarks for the CP-conserving Two-Higgs-Doublet Model
• Search for heavy resonances decaying into a pair of $Z$ bosons in the ${\ell }^{+}{\ell }^{-}{\ell }^{\prime +}{\ell }^{\prime -}$ and ${\ell }^{+}{\ell }^{-}\nu \bar{\nu }$ final states using 139 fb${}^{-1}$ of proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for heavy Higgs bosons decaying to a top quark pair in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Top-Quark Physics at the CLIC Electron-Positron Linear Collider
• A new jet reconstruction algorithm for lepton colliders
• Jet reconstruction at high-energy lepton colliders
• Approximate Alignment in Two Higgs Doublet Model with Extra Yukawa Couplings
• Electroweak baryogenesis via bottom transport
• Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV $pp$ collisions with the ATLAS detector
• Search for a heavy charged Higgs boson decaying into a $W$ boson and a Higgs boson in final states with leptons and $b$-jets in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Search for flavor-changing neutral current interactions of the top quark mediated by a Higgs boson in proton-proton collisions at 13 TeV