Measuring SUSY Parameters at LEP II Using Chargino Production and Decay

Abstract

Previously, in the context of the minimal supersymmetric standard model (without {\em a priori} assumptions of parameter unification), we studied the constraints on weak-scale SUSY parameters from chargino production at LEP II, using as observables $\mch$, $\mLSP$, the cross section and the leptonic branching fraction. Here, exploiting the high degree of polarization in chargino production, we add to our earlier work the forward-backward asymmetries of the visible hadrons and leptons in chargino decays. For a chargino that is mostly gaugino, the parameter space can now be restricted to a small region; $\tanb$ is constrained, the soft electroweak gaugino and electron sneutrino masses are determined to about 10\%, and the sign of $\mu$ may be determined. Constraints for a chargino that is mostly Higgsino are much weaker, but still disfavor the hypothesis that the chargino is mostly gaugino. For a chargino which is a roughly equal mixture of Higgsino and gaugino, we find intermediate results.

36 pp., ReVTeX, 15 uuencoded figures

References in corpus (3)

• Experimental Signatures of Low Energy Gauge Mediated Supersymmetry Breaking
• TESTING SUPERSYMMETRY AT THE NEXT LINEAR COLLIDER
• Detecting a Light Gravitino at Linear Collider to Probe the SUSY Breaking Scale

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