Searches for possible T-odd and P-odd interactions of mesoscopic range using polarized nuclei and nonmagnetic masses

Various theories predict the possible existence of T-odd and P-odd interactions of mesoscopic ranges (millimeters to microns) between two spin 1/2 fermions proportional to \textbf{S}$\cdot $\textbf{r}, where \textbf{S} is the spin of one of the fermions and \textbf{r} is the unit vector between the particles. We use ensembles of polarized nuclei and an unpolarized mass along with NMR technique to search for such an interaction over sub-mm ranges. We established an improved upper bound on $g_{s}g_{p}^{n}$, the product of the scalar coupling to particles in the unpolarized mass and the pseudoscalar 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]. We will describe this experiment and possible improvements. \\[4pt] [1] P. H. Chu, A. Dennis, C. B. Fu, H. Gao, R. Khatiwada, G. Laskaris, K. Li, E. Smith, W. M. Snow, H. Yan, and W. Zheng, Phys. Rev. D \textbf{87}, 011105(R) (2013)