Nucleon–meson coupling constants and form factors in the quark model

We demonstrate the calculation of the coupling constants and form factors required by effective hadron Lagrangians using the quark model. These relations follow from equating expressions for strong transition amplitudes in the two approaches. As examples we derive the NNm nucleon–meson coupling constants and form factors for m=π,η,η′,σ,a0,ω and ρ, using harmonic oscillator quark model meson and baryon wavefunctions and the 3P0 decay model; these results are relevant to quark-based descriptions of the NN force. This technique should be useful in the application of effective Lagrangians to processes in which the lack of data precludes the direct determination of coupling constants and form factors from experiment.