Mass and cross section measurements of chargino at linear colliders in large tanβ case

The lighter chargino pair production (e+e−→χ˜1+χ˜1−) is one of the key processes for determination of supersymmetric parameters at a linear collider. If tanβ is a large value, the lighter stau (τ˜1±) might be lighter than the χ˜1±, while the other sleptons stay heavier. This case leads to a cascade decay, χ˜1±→τ˜1±ντ followed by τ˜1±→χ˜10τ±, where χ˜10 is the lightest supersymmetric particle. This Letter addresses to what extent this cascade decay may affect the measurements of the chargino mass and its production cross section.