Chiral Symmetry and the Parity-Violating $NN\pi$ Yukawa Coupling
  We construct the complete SU(2) parity-violating (PV) $\pi, N, \Delta$ interaction Lagrangian with one derivative, and calculate the chiral corrections to the PV Yukawa $NN\pi$ coupling constant $h_\pi$ through ${\cal O}(1/\Lambda_\chi^3)$ in the leading order of heavy baryon expansion. We discuss the relationship between the renormalized $\hpi$, the measured value of $\hpi$, and the corresponding quantity calculated microscopically from the Standard Model four-quark PV interaction. 
Shi-Lin Zhu, S.J. Puglia, B.R. Holstein and M. J. Ramsey-Musolf