Preliminary search for $\tilde{\chi}_1^0 \rightarrow \tilde{\tau} \tau$ in light gravitino scenarios

Lightest neutralino pair pro duction is searched for within the light gravitino scenario. It is assumed that the lightest neutralino is the NNLSP and that the tau tilda is the NLSP. Data at 183 GeV centre of mass energy are analysed and two candidates are found. Limits on the lightest neutralino pair production cross section are set at 95% CL as a function of m_Chi tilda and m_tau tilda.