Study of Sleptons at a Linear Collider - Supersymmetry Scenario SPS 1a

The properties of the light charged sleptons in $\ser\ser$, $\smur\smur$ and $\stau_1\stau_1$ production are studied within the mSUGRA scenario SPS 1a. Various method are presented to determine very precisely masses, angular distributions, spin and couplings as well as the $\stau_1$ polarisation and mixing parameter in the $\stau$ sector. The analysis is based on a complete simulation of signal and background reactions assuming experimental conditions of the TESLA $e^+e^-$ Linear Collider.