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Photon structure functions in supersymmetric QCD are investigated in terms ofthe parton model where squark contributions are evaluated. We calculate theeight virtual photon structure functions by taking the discontinuity of thesquark massive one-loop diagrams of the photon-photon forward amplitude. Themodel-independent positivity constraints derived from the Cauchy-Schwarzinequalities are satisfied by the squark parton model calculation and actuallythe two equality relations hold for the squark contribution. We also show thatour polarized photon structure function $g_1^\gamma$ for the real photon leadsto the vanishing 1st moment sum rule, and the constraint $|g_1^\gamma|\leqF_1^\gamma$ is satisfied by the real photon. We also discuss a squark signaturein the structure function $W_{TT}^\tau$.

Squark Contributions to Photon Structure Functions and Positivity Constraints