Multi-tau lepton signatures in leptophilic two Higgs doublet model at the ILC

TL;DR

This paper explores the detection of tau-rich Higgs bosons predicted by the Type-X two Higgs doublet model at future colliders, proposing a four tau lepton signature as a promising search channel.

Contribution

It introduces a novel search strategy for tau-dominant Higgs bosons in the Type-X 2HDM at colliders, utilizing the collinear approximation for cleaner signals.

Findings

Four tau lepton signature is a promising signal at colliders.

The proposed method enhances the detection prospects of tau-rich Higgs bosons.

The model's parameters allow for detectable signals with current collider capabilities.

Abstract

We study the feasibility of the Type-X two Higgs doublet model (THDM-X) at collider experiments. In the THDM-X, new Higgs bosons mostly decay into tau leptons in the wide range of the parameter space. Such scalar bosons are less constrained by current experimental data, because of the suppressed quark Yukawa interactions. We discuss a search strategy of the THDM-X with multi-tau lepton final states at International linear collider and Large Hadron Collider. By using the collinear approximation, we show that a four tau lepton signature (e^+e^- -> HA -> 4\tau) can be a clean signal.