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[en] The structure functions of a real photon are calculable in QCD. The leading contribution is proportional to 1n Q2, with a coefficient reflecting the gluon flux in a real photon. We investigate this leading term for non-zero target photon mass. In an appropriate limit the gluon content in a virtual photon is found to vanish. The gluon radiative corrections of QCD can thus be turned off by tuning the target photon mass. (orig.)
Journal
Phys. Lett., B; ISSN 0370-2693; 
; v. 101(4); p. 263-266
; v. 101(4); p. 263-266