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

TL;DR

This study assesses the potential of the Compact Linear Collider to detect an extra Higgs boson through vector boson fusion and leptonic decay channels, enabling direct measurement of the HWW coupling.

Contribution

It provides a detector-level analysis demonstrating CLIC's sensitivity to an additional Higgs boson within the Two Higgs Doublet Model framework.

Findings

High-energy CLIC can probe the extra Higgs via the $H o W^+W^-$ channel.

The analysis allows for direct measurement of the $HWW$ coupling.

Sensitivity depends on the Higgs mixing angle $eta- ext{alpha}$.

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.