Couplings of NN(n\pi) n \geq 1
  Determinations of the couplings of $N N (n \pi) (n \geq 1)$ are reported. The study is based on both a quark model of nucleon and a chiral field theory of mesons. The coupling of $N N \pi$ is predicted and is in agreement with current value. It shows that the coupling $ N N 2 \pi $ is resulted in the nature that pion is a Goldstone boson. The couplings of $N N (n \pi) (n \geq 2)$ are predicted by this approach. 
Bing An Li (Univ. of Kentucky)
hep-ph