To the question on the spin crisis

摘要

Change of polarization degree of virtual photon due to the initial state radiation of real photons at longitudinal polarized lepton-nucleon scattering is considered. To take into account the radiative correction (RC) the structure function (SF) method is used. Photon spin of SF by resolving the Dokshizer- Gribov-Lipatov-Altarelli-Parisi (D-G-L-A-P) equation is defined. It was shown, that in frame work leading logarithmical approximation one can find the solution of the D-G-L-A-P equation for densities of the distributions photon using an iteration method and known thq solution of non singlet contribution. It was found that RC change the structure of depolarization factor and there are big difference between low and high order at small value of energy fraction of virtual photon, e.g. y<0.1 5 refs. Published in the Bulletin Kazak State National Univ. Physical series no. 4