Higgs portal dark matter at a linear collider

TL;DR

This paper explores the potential of future linear colliders like ILC and CLIC to detect Higgs portal dark matter through Z boson fusion, especially when Higgs decay into dark matter is kinematically forbidden.

Contribution

It demonstrates the feasibility of probing Higgs portal dark matter at linear colliders via Z boson fusion, extending detection possibilities beyond LHC capabilities.

Findings

Detection possible at ILC and CLIC via Z fusion process

Effective even when Higgs decay to dark matter is kinematically forbidden

Provides complementary search strategies to LHC experiments

Abstract

We investigate the possibility of detecting dark matter at TeV scale linear colliders in the scenario where the dark matter interacts with standard model particles only via the Higgs boson. In this scenario, the dark matter would be difficult to be tested at the LHC especially when the decay of the Higgs boson into a dark matter pair is not kinematically allowed. In this talk, we discuss whether even such a case can be explored or not at the ILC and CLIC via the Z boson fusion process. This talk is mainly based on Phys. Rev. D 82, 055026 (2010) and Phys. Lett. B 701, 591 (2011).