Polarisation in Sfermion Decays: Determining \tanβand Trilinear Couplings

Abstract

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 \tildeτ and \tilde{t} or \tilde{b} decays to τleptons and t quarks plus neutralinos or charginos can be used to measure \tanβ(in particular for large values) and to determine the trilinear couplings A_τ, A_t and A_b in sfermion pair production.

20 pages, 11 eps figures