ABSTRACT
The matrix element for the interaction of an electron, say, and a proton involves the diagonal element of the current operator <p|Jp|p>. We can gain some insight into the meaning of form factors by looking at the non-relativistic case. For a spinless system the form factor is just the momentum representation of the charge density. Relativistically the fact that as Q2 ? 8 the form factors go to zero means that there is zero probability to find the proton alone as a point charge. This could result in field theory either from there being no ideal field entity (parton) with quantum numbers of the proton, or else, if there were such the real proton is always dressed, it has zero qmplitude of being an ideal proton.
