Detector Optimization for SiD using PFA

A summary of the optimization of the SiD detector is given. To optimize its performance in terms of Particle Flow Algorithms (PFA), five basic detector parameters have been varied and the impact on the obtained energy resolution using Particle Flow Algorithms has been studied using di-jets events. Finally the optimized detector used for the Letter of Intent (LoI) is briefly summarized as a result from these studies.