Abstract

Using a perturbative approach to the independent particle approximation (IPA)breaking effects we find analytical equations which enable us to obtain the highenergy behaviour beyond IPA. The IPA breaking contributions to the crosssections are expressed as the IPA matrix elements of relatively simple operators.The equations for the cross section ratios are shown to be valid over a broadenergy interval. We also obtain the quantitative criteria, which enable us topredict which of the couplings are significant for the fixed values of the photonenergy. We compare our perturbative results to our numerical calculations.Accounting for IPA breaking effects is shown either to eliminate or to diminishstrongly the discrepancy between the experimental data and the results of IPAcalculations.

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