A DISPERSION THEORETIC STUDY OF PION FORM FACTOR*

We show that the pion electromagnetic form factor satisfies a nonsubtracted dispersion relation, if one of the pions is taken to be massless. We point out that by quantizing the theory on the light-cone the mass extrapolation ambiguity due to one of the pions being massless can be overcome, We then use this result to establish an upper bound on the pion’s charge radius. (Submitted for publication) *Work supported by the Energy Research and Development Administration.-2-1