One-loop effects on MSSM parameter determination via chargino production at the LC

TL;DR

This paper investigates how one-loop quantum corrections impact the precise determination of MSSM parameters through chargino production measurements at a future linear collider, considering realistic scenarios and existing LHC constraints.

Contribution

It presents a detailed analysis of incorporating one-loop effects into parameter fitting for chargino-neutralino sectors, enhancing the accuracy of supersymmetric parameter extraction.

Findings

One-loop corrections significantly affect parameter determination.

Accurate measurements can reveal stop masses and mixing angles.

Feasible parameter extraction under realistic collider scenarios.

Abstract

At a future linear collider, very precise measurements, typically with errors of <1%, are expected to be achievable. Such an accuracy yields sensitivity to quantum corrections, which therefore must be incorporated into theoretical calculations in order to determine the underlying new physics parameters from linear collider measurements. In the context of the chargino--neutralino sector of the minimal supersymmetric standard model, this involves fitting one-loop predictions to prospective measurements of cross sections, forward-backward asymmetries and the accessible chargino and neutralino masses. Taking recent results from LHC SUSY and Higgs searches into account, we consider three phenomenological scenarios, each displaying characteristic features. Our analysis demonstrates how an accurate determination of the desired parameters is possible, and could additionally provide access to the stop masses and mixing angle.