Parity violation in neutron spin rotation

Nonleptonic weak interactions remain one of the most poorly understood sectors of the Standard Model. A quantitative description of the weak nucleon–nucleon (NN) interaction is needed to understand weak interaction phenomena in atomic, nuclear, and hadronic systems. Measurements with low energy neutrons can lead to significant experimental progress and have the potential to illuminate poorly understood features of QCD. I describe the phenomenon of parity-odd neutron spin rotation and outline experimental strategies to isolate this phenomenon in the NN system and in light nuclei.