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.
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Notes
We adopt the convention that M 2 is real.
Here N i should not be confused with the neutralino mass matrix N ij .
Note that in light of current LHC limits, the value M 3=700 GeV in S1 and S2 means that the gluino mass is rather low, however, our results are largely independent of this choice as M 3 only enters our calculations via two loop corrections to m h .
Note that in S1(S2) a Higgs mass of m h =125 GeV can also be achieved by adopting cosθ t =−0.4(−0.5).
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Acknowledgements
The authors gratefully acknowledge support of the DFG through the grant SFB 676, “Particles, Strings, and the Early Universe”, as well as the Helmholtz Alliance, “Physics at the Terascale”. This work was also partially supported by the Polish National Science Centre under research grant DEC-2011/01/M/ST2/02466 and the MICINN, Spain, under contract FPA2010-17747; Consolider-Ingenio CPAN CSD2007- 00042. KR thanks as well the Comunidad de Madrid through Proyecto HEPHACOS S2009/ESP-1473 and the European Commission under contract PITN-GA-2009-237920.
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Bharucha, A., Kalinowski, J., Moortgat-Pick, G. et al. One-loop effects on MSSM parameter determination via chargino production at the LC. Eur. Phys. J. C 73, 2446 (2013). https://doi.org/10.1140/epjc/s10052-013-2446-2
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DOI: https://doi.org/10.1140/epjc/s10052-013-2446-2