Metrology requirements for the integrated luminosity measurement using small angle Bhabha scattering at ILC

TL;DR

This paper reviews the metrology requirements for accurately measuring the integrated luminosity at the ILC using small-angle Bhabha scattering, crucial for precise cross-section and line-shape measurements at future Higgs factories.

Contribution

It provides an up-to-date assessment of the metrology precision needed for luminosity measurements at various ILC energies, filling a gap in current estimates.

Findings

Metrology requirements vary across different ILC energies.

Current uncertainties in luminosity measurement are not well quantified.

Guidelines for metrology precision are proposed for future experiments.

Abstract

Precision measurement of the integrated luminosity $\mathcal{L}$ at future Higgs factories, including ILC, is of crucial importance for the cross-section measurements, and in particular for the line-shape measurements at the Z-pole. Since there is no up-to-date estimate of the integrated luminosity uncertainties arising from metrology effects at ILC, here we review the metrology requirements for the targeted precision of $\mathcal{L}$ at foreseen ILC center-of-mass energies: 91.2 GeV, 250 GeV, 500 GeV and 1 TeV, using small-angle Bhabha scattering.