A measurement of parity-violating spin-dependent $\gamma \overrightarrow{p}$ Compton scattering will provide a theoretically clean determination of the parity-violating pion-nucleon coupling constant $h_{\pi \mathrm{NN}}^{\mathrm{}\left(1\right)\mathrm{}}.$ We calculate the leading parity-violating amplitude arising from one-loop pion graphs in chiral perturbation theory. An asymmetry of $\sim 5\times {10}^{-8}$ is estimated for Compton scattering of $100\hspace{0.5em}\mathrm{MeV}$ photons.

• Received 19 October 1999

DOI:https://doi.org/10.1103/PhysRevC.62.018501