Are point-particles "real"? I've heard a couple of times the claim that the electron (among other elementary particles) is point-like, having essentially no spatial extension. In the framework of QFT (which forms the basis of the standard model and therefore our best current understanding of the fundamentals of physics) particles are thought of as excitations in an underlying field. These excitations, when localized, come in the form of wave packets which do have a nonzero spatial extension. The electron would not be pointlike unless its momentum was totally undetermined, right? From what I understand, the structure of particles is determined from various scattering experiments where the momenta of the particles that are collided are quite well-defined. Can someone explain this to me?