Optimal polarized observables for model-independent new physics searches at the linear collider

TL;DR

This paper explores how polarized observables at a linear collider can optimally detect model-independent new physics signals through four-fermion contact interactions, emphasizing the importance of beam polarization and optimized cuts.

Contribution

It introduces a method using polarized integrated cross sections and optimal cuts to enhance sensitivity to new physics in fermion-pair production at the linear collider.

Findings

Beam polarization significantly improves sensitivity to new interactions.

Optimal cuts enhance the detection capability of contact interactions.

Model-independent constraints are more effectively derived with polarization.

Abstract

We discuss the sensitivity to four-fermion contact interactions of the process of fermion-pair production at the e^+ - e^- Linear Collider (LC), with E_{CM}=0.5 TeV and longitudinally polarized electron beam. The analysis is based on polarized integrated cross sections with optimal cuts. Beam polarization and optimization are shown to have a crucial role in the derivation of model-independent constraints on the new interactions from the data.