Constraints on Possible Monopole-Dipole Interactions of WISPs from the Transverse Relaxation Time of Polarized ${}^3$He Gas

Changbo Fu, Thomas R. Gentile, William M. Snow

Various theories beyond the Standard Model predict new particles with masses in the sub-eV range with very weak couplings to ordinary matter. A $P$-odd, $T$-odd, spin-dependent int…