Precision luminosity measurement at ILC

TL;DR

This paper introduces a new method for measuring luminosity at the ILC that minimizes beam-induced uncertainties to a few permille, independent of beam parameter precision, enhancing measurement accuracy.

Contribution

It presents a novel approach based on relativistic kinematics of the Bhabha process to reduce beam-beam related uncertainties in luminosity measurement.

Findings

Uncertainty reduced to a few permille in the peak region.

Method effective above 80% of nominal centre-of-mass energy.

Independent of beam parameter precision.

Abstract

In these proceedings a novel approach to deal with the beam-induced effects in luminosity measurement is presented. Based on the relativistic kinematics of the collision frame of the Bhabha process, the beam-beam related uncertainties can be reduced to the permille level independently of a precision with which the beam parameters are known. Specific event selection combined with the corrective methods we introduce, leads to the systematic uncertainty from the beam-induced effects to be at a few permille level in the peak region above the 80% of the nominal centre-of-mass energies at ILC.