Impact of Tau Polarization for the determination of high \tan\beta and   A_{\tau}
  In order to determine the fundamental MSSM parameters M_1, M_2, \mu and \tan\beta the tau polarization from stau decays can be explored as a `bridge' between the gaugino/higgsino and the stau sector in particular in the high \tan\beta range. Even in the case of high \tan\beta an accuracy of \delta(\tan\beta)\approx 5% with an simultanous determination of A_{\tau} is possible without assuming a specific SUSY breaking scheme. 
E. Boos, G. Moortgat-Pick, H.U. Martyn, M. Sachwitz, A.Vologdin