Determining SUSY Parameters in Chargino Pair Production in e^+e^- Collisions

In most supersymmetric theories, charginos ${\tilde{\chi }}_{1,2}^{\pm }$ belong to the class of the lightest supersymmetric particles and they are easy to observe at e^+e^- colliders. By measuring the total cross sections and the left-right asymmetries with polarized beams as well as the angular correlations of the decay products of the charginos in $e^+e^-\to\tilde{\chi}^-_i\tilde{\chi}^+_j [i,j=1,2]$, the chargino masses and the gaugino-higgsino mixing angles can be determined. From these observables the relevant fundamental SUSY parameters can be derived: M_2, $\mathrm{\mid }\mu \mathrm{\mid }$, $\cos {\mathrm{\Phi }}_{\mu }$, and $\tan \beta =v_2\mathrm{/}{v}_1$. The solutions are unique.