Searches for possible T-odd and P-odd short range interactions using polarized nuclei

摘要

Various theories predict the possible existence of T-odd and P-odd shortrange forces between spin ? fermions, proportional to S?r where S is the fermion spin and r is the separation between particles. We use ensembles of polarized nuclei and an un-polarized mass to search for such a force over sub-mm ranges. We established an improved upper bound on the product gsgpn of the scalar coupling to particles in the un-polarized mass and the pseudo-scalar coupling of polarized neutrons for force ranges from 10?4 to 10?2 m, corresponding to a mass range of 2?10?3 to 2?10?5 eV for the exchange boson [1].