Radiatively generated parton distributions of real and virtual photons

  title={Radiatively generated parton distributions of real and virtual photons},
  author={Mary Gluck and Ewald Reya and I. Schienbein},
  journal={Physical Review D},
The parton content of real ${(P}^{2}=0)$ and virtual ${(P}^{2}\ensuremath{\ne}0)$ transverse photons $\ensuremath{\gamma}{(P}^{2})$ is expressed in terms of perturbative pointlike and nonperturbative hadronic (VMD) components, employing recently updated parton distributions of pions and protons. The resulting parameter-free and perturbatively stable LO and NLO parton densities ${f}^{\ensuremath{\gamma}{(P}^{2})}{(x,Q}^{2})$ are smooth in ${P}^{2}$ and apply to all ${P}^{2}g~0$ whenever… 

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