The basic parameters of supersymmetric theories can be determined at future e^+e^- linear colliders with high precision. We investigate in this report how polarisation measurements in \tilde{\tau} and \tilde{t} or \tilde{b} decays to \tau leptons and t quarks plus neutralinos or charginos can be used to measure \tan\beta (in particular for large values) and to determine the trilinear couplings A_{\tau}, A_t and A_b in sfermion pair production.
@article{arxiv.hep-ph/0303110,
title = {Polarisation in Sfermion Decays: Determining \tan\beta and Trilinear Couplings},
author = {E. Boos and H. -U. Martyn and G. Moortgat-Pick and M. Sachwitz and A. Sherstnev and P. M. Zerwas},
journal= {arXiv preprint arXiv:hep-ph/0303110},
year = {2011}
}