ar X iv : h ep - p h / 99 05 48 9 v 1 2 6 M ay 1 99 9 1 Spin structure function of the virtual photon ∗
نویسنده
چکیده
In the last several years the nucleon’s spin structure functions have been extensively studied by deep inelastic scattering of polarized leptons on polarized nucleon targets. Recently there has been growing interest in the polarized photon structure function. Especially its first moment has attracted much attention in the literature in connection with the axial anomaly. Now the information on the spin structure of the photon would be obtained by the resolved photon processes in the polarized electron and proton collision in the polarized version of HERA. More directly the spin-dependent structure function of photon g 1 can be measured by the polarized e e collisions in the future linear colliders (Fig.1). We investigate the polarized virtual photon structure function g 1 (x,Q , P ) beyond the leading order in QCD, in the kinematical region:
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