A study of the measurement precision of the Higgs boson decaying into tau pairs at the ILC

TL;DR

This paper assesses the measurement accuracy of the Higgs boson's decay into tau pairs at the ILC, demonstrating potential precision improvements with upgraded luminosity scenarios.

Contribution

It provides detailed estimates of measurement precision for Higgs to tau tau decays at the ILC, including effects of different production mechanisms and luminosity scenarios.

Findings

Precision of 2.6% for Higgs-strahlung process

Precision of 6.9% for WW-fusion process

Improved precision to 1.0% and 3.4% with luminosity upgrades

Abstract

We evaluate the measurement precision of the production cross section times the branching ratio of the Higgs boson decaying into tau lepton pairs at the International Linear Collider (ILC). We analyze various final states associated with the main production mechanisms of the Higgs boson, the Higgs-strahlung and WW-fusion processes. The statistical precision of the production cross section times the branching ratio is estimated to be 2.6% and 6.9% for the Higgs-strahlung andWW-fusion processes, respectively, with the nominal integrated luminosities assumed in the ILC Technical Design Report; the precision improves to 1.0% and 3.4% with the running scenario including possible luminosity upgrades. The study provides a reference performance of the ILC for future phenomenological analyses.