Twist-3 Effects in Polarized Photon Structure
  The polarized photon structure is described by two spin structure functions $g_1^\gamma$ and $g_2^\gamma$ which can be studied in the future polarized ep or e$^+$e$^-$ colliders. Here we investigate the QCD twist-3 effects in $g_2^\gamma$ to the leading order in QCD. 
Hideshi Baba, Ken Sasaki and Tsuneo Uematsu