Charged Higgs Study through Triple or Double Higgs Production in a General Two Higgs Doublet Model at Future Lepton Collide

TL;DR

This paper investigates the potential to detect charged Higgs bosons via triple and double Higgs production processes at a future 1.5 TeV electron-positron collider, demonstrating feasible signal significance within certain mass ranges.

Contribution

It introduces a detailed analysis of charged Higgs production through specific multi-Higgs processes in a general 2HDM at future colliders, including background suppression strategies.

Findings

High signal significance achievable with 500 fb^{-1} luminosity.

Effective background rejection using b-tagging techniques.

Detectable charged Higgs signals for masses between 170 and 400 GeV.

Abstract

In this study the charged Higgs signal through triple or double Higgs production in a general two Higgs doublet model (2HDM) is investigated. The main production process is $e^+e^- \rightarrow H^+H^-H^0$ followed by the charged Higgs decay to a pair of $\tau \nu$ and the neutral Higgs decay to $b\bar{b}$. The alternative process $H^+W^-H^0$ is also included as a source of charged Higgs signal in the analysis having comparable cross-section. The focus is on a future $e^+e^-$ linear collider operating at $\sqrt{s}=1.5$ TeV. The final state under consideration ($\tau^+ \tau^- b \bar{b} E^{\textnormal{miss}}_{T}$) is suitable for electroweak background rejection using the $b-$tagging tools. It is shown that although the signal cross section is small, with a reasonable background suppression, high signal significance values are achievable at an integrated luminosity $500 fb^{-1}$ depending on the charged Higgs mass, $\tan\beta~$ and the CP-odd neutral Higgs mass. Finally results are quoted in terms of the signal significance for charged Higgs in the mass range $170<m_{H^{\pm}}<400$ GeV.