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Future high-energy $e^+e^-$ colliders will provide some of the most precisetests of the Standard Model. Statistical uncertainties on electroweak precisionobservables and triple gauge couplings are expected to improve by orders ofmagnitude over current measurements. This provides a new challenge inaccurately assessing and minimising the impact of systematic uncertainties.Beam polarisation may hold a unique potential to isolate and determine the sizeof systematic effects. So far, studies have mainly focused on the statisticalimprovements from beam polarisation. This study aims to assess, for the firsttime, its impact on systematic uncertainties. A combined fit of precisionobservables, such as chiral fermion couplings and anomalous triple gaugecouplings, together with experimental systematic effects is performed ongenerator-level differential distribution of 2-fermion and 4-fermionfinal-states. Different configurations of available beam polarisations andluminosities are tested with and without systematic effects, and will bediscussed in the context of the existing projections on fermion and gauge bosoncouplings from detailed experimental simulations.

Interplay of beam polarisation and systematic uncertainties at future $e^+e^-$ colliders