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

Understand

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.