Asymptotic behaviour of form factors of half-integer spin particles

Abstract

A composi te model of hadrons, which reproduces the t 2 decrease of the magnet ic form factor of the proton, has been recent ly proposed by several authors (1,4): s t rongly in te rac t ing part icles arc considered as bound states and the result is obta ined using the asympto t ic propert ies of the Bethe-Salpc tcr wave funct ion or of the F e y n m a n graph. In par t icular in ref. (2) bounds have been obta ined for any e lec t romagnet ic t rans i t ion between integer-spin part icles and for the J = 8 9 89 case. In the f ramework of the same model, the procedure of ref. (2) can be general ized to include the general halfinteger spin case: the bounds which we obtain, and which are the analogous of cqs. (36) of ref. (2), arc (t -(p q)2)