We report on calculations of the hadronic coupling constants gρππ and gnnπ based on lattice QCD with four flavors of dynamical staggered fermions. By computing 2--point and 3--point Green's functions we have been able to determine these coupling constants ab initio from QCD; the results are compatible with the experimental values.
@article{arxiv.hep-lat/9401001,
title = {Hadronic coupling constants in lattice QCD},
author = {R. Altmeyer and M. Goeckeler and R. Horsley and E. Laermann and G. Schierholz and P. M. Zerwas},
journal= {arXiv preprint arXiv:hep-lat/9401001},
year = {2009}
}