Determination of the CP parity of Higgs bosons in their tau decay channels at the ILC

TL;DR

This paper proposes a method to determine the CP parity of Higgs bosons via tau decay channels at the ILC, applicable to leptonic and hadronic decay modes, assuming the production vertex can be measured.

Contribution

It introduces a new technique for CP determination of Higgs bosons in tau decays at future linear colliders, expanding analysis capabilities.

Findings

Method is feasible for leptonic tau decays.

Method is feasible for hadronic tau decays.

Applicable to Higgs-strahlung process at ILC.

Abstract

We investigate a method for determining the CP nature of a neutral Higgs boson or spin-zero resonance at a future linear e+e- collider (ILC) in its tau decay channel. Our procedure is applicable if the production vertex of the Higgs boson can be measured. This will be the case, for example, for the Higgs-strahlung process. We show that the method is feasible for both the leptonic and the hadronic 1-prong tau decay modes.