Neutron-Dipolmoment
Prof. Dr. Peter Fierlinger (TU München, Garching)

Since the 1950 ′s people search for permanent electric dipole moments (EDM) of fundamental systems. A non-zero EDM would be an unambiguous manifestation of parity (P) and time reversal symmetry (T) violation. Assuming the conservation of CPT, T violation in a fundamental system also means CP violation. Although the Standard Model of particle physics (SM) includes measured CP violation, it cannot account for the observed baryon-asymmetry in the Universe by many orders of magnitude. EDMs are considered promising candidate systems to find new CP violation as they occur as a natural consequence of many theories beyond the SM. The experimental limit for the EDM of the neutron, d_n < 2.9E-26 e.cm, is still large compared to the SM predicition, d_n ~ 1E-32 e.cm. While this is far beyond achievable sensitivities, already the current limits rule out many theories beyond the SM. Theories like Supersymmetry require EDMs within reach of the oncoming generation of experiments, making EDMs alternative probes of physics at the TeV scale. In this talk, the status and new ideas in the field will be reviewed. This includes a new neutron EDM experiment which is currently set up at PSI and an alternative approach using an atomic system, performed at the TUM.