Abstract
At a future linear collider very precise measurements, typically with errors of <1 %, are expected to be achievable. Such an accuracy gives sensitivity to the quantum corrections, which therefore must be incorporated in theoretical calculations in order to determine the underlying new physics parameters from prospective 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 the cross sections, forward–backward asymmetries and of the accessible chargino and neutralino masses. Taking recent results from LHC SUSY and Higgs searches into account we consider three phenomenological scenarios, each with characteristic features. Our analysis shows how an accurate determination of the desired parameters is possible, providing in addition access to the stop masses and mixing angle.
Highlights
In this paper we study the determination of the fundamental parameters in the chargino–neutralino sector of the minimal supersymmetric standard model (MSSM), via chargino production at a linear collider (LC)
We have extended previous analyses, which fitted observables for chargino production at the LC to extract fundamental MSSM parameters, by incorporating next-to-leading order (NLO) corrections
The loop corrections are calculated for all observables fitted, namely the polarized cross-sections and forward–backward asymmetry for chargino production as well as the χ1±, χ2± and χ10, χ20, χ30 masses, in an on-shell scheme which facilitates the extension to the complex case
Summary
Due to the expected high precision of mass and coupling measurements at the LC, as well as the fact that one-loop effects in the MSSM may be sizeable, higher order effects have to be considered. Taking these corrections into account additional MSSM parameters become relevant, such as the masses of the stops and sleptons, which are so far weakly constrained by the LHC. In this paper we show how it would be possible to determine the fundamental parameters of the chargino and neutralino sector at the LC, including the complications arising due to higher order effects.
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