Search for Electric Dipole Moments at COSY in Jülich - Spin-Tracking Simulations using BMAD

The observed matter-antimatter asymmetry in the universe cannot be explained by the StandardModel (SM) of particle physics. In order to resolve the matter dominance an additional CP violatingphenomenon is needed. A candidate for physics beyond the SM is a non-vanishing Electric DipoleMoment (EDM) of subatomic particles. Since permanent EDMs violate parity and time reversalsymmetries, they are also CP violating if the CPT-theorem is assumed.The JEDI (Jülich Electric Dipole moment Investigations) collaboration in Jülich is preparing adirect EDM measurement of protons and deuterons first at the storage ring COSY (COoler SYn-chrotron) and later at a dedicated storage ring.In order to analyse the data and to disentangle the EDM signal from systematic effects spin trackingsimulations are needed. Therefore a model of COSY was implemented using the software libraryBmad. It includes the measured magnet misalignments of the latest survey and a simplifieddescription of the RF-Wien Filter device that is used for the EDM measurement. The modelwas successfully benchmarked using analytical predictions of the spin behavior. A crucial pointregarding the data analysis is the knowledge of the orientation of the invariant spin axis withvanishing EDM at the position of the RF-Wien Filter. Especially its radial component is unknownand spin tracking simulations can be used to determine this missing number. Tracking results aswell as the algorithm to find the invariant spin axis will be presented