Signature for charged Higgs pair production in 2HDM+a model at CLIC

TL;DR

This paper investigates the potential to detect charged Higgs bosons in the 2HDM+a model at CLIC, focusing on pair production and decay channels, and assesses the discovery and exclusion prospects at 1500 GeV.

Contribution

It provides the first detailed simulation study of charged Higgs pair production in the 2HDM+a model at CLIC, including decay channels and sensitivity analysis.

Findings

Charged Higgs bosons up to 600 GeV can be discovered at 5σ significance.

Exclusion limits for $m_{H^ op}$ between 400 and 650 GeV are established.

Signal significance depends on the mass parameters and decay channels.

Abstract

In this work, we study the search for charged Higgs bosons in the Two-Higgs-Doublet Model plus an additional pseudo-scalar (2HDM+a) at the Compact Linear Collider (CLIC). Focusing on the pair production of charged Higgs bosons, followed by the decays $H^\pm \to a W $ and $ H^\mp \to t b $, we analyze the signal channel of $4j+2b+E_T^{miss}$. Given the center-of-mass energy of CLIC as $ \sqrt{s} = 1500$ GeV, charged Higgs bosons with masses $ m_{H^\pm} < \sqrt{s}/2$ are explored. Simulation results indicate that the signal significance of 400 GeV and 600 GeV charged Higgs bosons can reach $5\sigma$ in specific parameter spaces, and the $2\sigma$ exclusion limits in the $m_{H^\pm}- m_a$ plane are presented for $m_{H^\pm}$ in the range of [400, 650] GeV.