MSSM parameter determination via chargino production at the LC: NLO corrections

TL;DR

This paper demonstrates how precise measurements at future linear colliders can be used to determine MSSM parameters, including quantum corrections, through one-loop predictions of chargino production.

Contribution

It introduces a method for fitting one-loop predictions to collider measurements to accurately extract MSSM parameters, including the lighter stop mass.

Findings

Accurate parameter determination is feasible with <1% measurement errors.

Quantum corrections are essential for meaningful MSSM parameter extraction.

The method provides access to the lighter stop mass.

Abstract

Very precise measurements of masses and cross sections, with errors of <1%, are expected to be achievable with a future linear collider. Such an accuracy gives sensitivity at the level of quantum corrections, which therefore must be incorporated in order to make meaningful predictions for the underlying new physics parameters. For the chargino-neutralino sector, this involves fitting one-loop predictions to expected measurements of the cross sections and forward-backward asymmetries and of the accessible chargino and neutralino masses. Our analysis shows how an accurate determination of the desired parameters is possible, providing in addition access to the mass of the lighter stop.