Parity violation in neutron capture on the proton: determining the weak pion-nucleon coupling

Understand

We investigate the parity-violating analyzing power in neutron capture on the proton at thermal energies in the framework of chiral effective field theory.

• By combining this analysis with a previous analysis of parity violation in proton-proton scattering, we are able to extract the size of the weak pion-nucleon coupling constant.
• The uncertainty is significant and dominated by the experimental error which is expected to be reduced soon.