A SIXTH-ORDER CALCULATION OF THE HIGH-ENERGY BEHAVIOUR OF THE FORM-FACTORS IN NON-ABELIAN GAUGE THEORIES

Abstract

The high-energy behaviour of the Fermion form-factors in non-Abelian theories is calculated to the sixth order in the perturbation theory. Certain manipulation methods and criterions for checking the results are found to guarantee that, when domains of integration having leading contributions are separated out, no double-counting or omission is made. Results of the calculation show that, to the leading order in logarithms, the gauge group scalier part of the form-factor exponentiates, while the gauge group vector part does not. The breaking of the exponentiation of the latter begins at the sixth order.