Mass and Cross-section Measurements of Chargino at Linear Colliders in Large tan(beta) Case

Abstract

The lighter chargino pair production ($e^+e^- \to \tilde{\chi}^{+}_{1} \tilde{\chi}^{-}_{1}$) is one of key processes for determination of supersymmetric parameters at a linear collider. If $\tan\beta$ is a large value, the lighter stau ($\tilde{\tau}^{\pm}_{1}$) might be lighter than the $\tilde{\chi}^{\pm}_{1}$, while the other sleptons stay heavier. This case leads a cascade decay, $\tilde{\chi}^{\pm}_{1} \to \tilde{\tau}^{\pm}_{1} \nu_{\tau}$ followed by $\tilde{\tau}^{\pm}_{1} \to \tilde{\chi}^{0}_{1} \tau^{\pm}$, where $\tilde{\chi}^{0}_{1}$ is the lightest supersymmetric particle. This paper addresses to what extent this cascade decay may affect the measurements of the chargino mass and its production cross section.