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Polarized virtual photon structure function<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi>g</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mi>γ</mml:mi></mml:mrow></mml:msubsup></mml:mrow></mml:math>and twist-3 effects in QCD
We investigate twist-3 effects in the polarized virtual photon structure. The structure functions ${g}_{1}^{\ensuremath{\gamma}}$ and ${g}_{2}^{\ensuremath{\gamma}}$ of a polarized photon could be experimentally studied in future polarized ep or ${e}^{+}{e}^{\ensuremath{-}}$ colliders. The leading contributions to ${g}_{1}^{\ensuremath{\gamma}}$ are twist-2 effects, while another structure function ${g}_{2}^{\ensuremath{\gamma}},$ which exists only for the virtual …