Luminosity measurement at ILC

TL;DR

This paper presents a novel method for measuring luminosity at the ILC that effectively reduces systematic uncertainties from beam effects and background, achieving high precision across all energies.

Contribution

It introduces a new approach based on relativistic kinematics and specific event selection to minimize systematic uncertainties in luminosity measurement at the ILC.

Findings

Systematic uncertainty reduced to a few permille level.

Method is effective across all ILC energies.

Achieves the precision required for physics goals.

Abstract

In this paper we describe a method of luminosity measurement at the future linear collider ILC that estimates and corrects for the impact of the dominant sources of systematic uncertainty originating from the beam-induced effects and the background from physics processes. Based on the relativistic kinematics of the collision frame of the Bhabha process, the beam-beam related uncertainty is reduced to a permille independently of the precision with which the beam parameters are known. With the specific event selection, different from the isolation cuts based on topology of the signal used at LEP, combined with the corrective methods we introduce, the overall systematic uncertainty in the peak region above 80% of the nominal center-of-mass energy meets the physics requirements to be at the few permille level at all ILC energies.