Neutrino-Nucleus scattering

This thesis (http://compphys.ugent.be/docs/theses/WauthierSamuelThierry_2016-2017.pdf) indicates that the "coupling constant" (i.e. the term attached to the spinors and momentum 4-vectors) is:

$$-frac{G_F}{sqrt{2}}Q_Wg_Lgamma^mu(1-gamma^5)F(q^2)$$

where $F(q^2)$ is the nuclear form factor. So the "coupling constant" is explicitly a function of the momentum transfer in the reaction, and not in a trivial way - nuclear form factors do not come from first principles, and must be measured in experiments.