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

Abstract

The lighter chargino pair production ($e^+e^- \to \tildeχ^{+}_{1} \tildeχ^{-}_{1}$) is one of key processes for determination of supersymmetric parameters at a linear collider. If $\tanβ$ is a large value, the lighter stau ($\tildeτ^{\pm}_{1}$) might be lighter than the $\tildeχ^{\pm}_{1}$, while the other sleptons stay heavier. This case leads a cascade decay, $\tildeχ^{\pm}_{1} \to \tildeτ^{\pm}_{1} ν_τ$ followed by $\tildeτ^{\pm}_{1} \to \tildeχ^{0}_{1} τ^{\pm}$, where $\tildeχ^{0}_{1}$ 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.