Precision Study of MSSM at Futuree+e-Linear Colliders

The lighter scalar tau lepton $\sti$ may be the lightest scalar lepton andtherefore would be found earlier in future collider experiments. We point outthe impact of the measurement of the mass and the mixing angle of $\st$ todiscriminate the models of SUSY breaking. Furthermore, the measurement of thepolarization of $\tau$ lepton($P_{\tau}$) from the decaying $\sti$ helps todetermine the Yukawa sector of minimal supersymmetric standard model. Wepresent our MC study of the production and the decay of $\sti$ lepton at afuture linear collider at $\sqrt{s}=500$ GeV. The mass, mixing angle of $\sti$and $P_{\tau}(\sti\rightarrow\tau \chi_1^0)$ would be measured precisely at thefuture LC. ( talks given at Yukawa International Seminar(YIKS) '95 on some veryhot and humid day in August, and also at Workshop on {\it Physics andExperiments with Linear $e^+e^-$ Colliders} Appi, Iwate Japan Sep.8-12 1995.)Comment: 7 pages, no figure. Complete version with 5 figures avaiable at ftp://ftp.kek.jp/kek/preprints/TH/TH-455 . Hard copy is also avaiable directly from the author(nojirim@theory.kek.jp); uses ptptex.st