Cobra Performance

This note presents the performance of the Cobra combined muon reconstruction package. It consists of two parts: the first part gives a proof of concept of the generic fit, as implemented in Cobra, and tests the fit qualitatively. The second part uses single tracks to estimate the Cobra 'physics' performance and compares the resultant momentum resolutions with those of the final fits of the Atlas pattern recognition packages iPatRec and Muonbox. The performance of the combined, global fit is compared to the results of the muon identification package MuID.