TL;DR
This paper reviews the importance of beam polarisation in future $e^+e^-$ colliders, highlighting its role in various physics measurements and discussing a polarimetry method to achieve high precision.
Contribution
It introduces a polarimetry concept combining Compton polarimeters, simulations, and data analysis to attain permille-level polarisation knowledge at future colliders.
Findings
Polarisation enhances Higgs, top, and electroweak physics measurements.
A polarimetry method achieves permille-level precision.
The approach integrates multiple techniques for optimal accuracy.
Abstract
Beam polarisation is an integral part of the physics case of future Linear Colliders. In this contribution, important examples from Higgs coupling measurements, top and electroweak physics at high energies, the Z pole program as well as from searches for production of new particles will be reviewed. The full exploitation of its advantages requires the polarisation to be known at the permille-level. The a polarimetry concept based on the combination of Compton polarimeters, spin-tracking simulations and a global analysis of collision data which has been developed for the ILC to achieve the required precision will be presented.
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