Has the QCD RG-Improved Parton Content of Virtual Photons been Observed?
M. Gluck, E. Reya, I. Schienbein
Abstract
It is demonstrated that present e+e- and DIS ep data on the structure of the virtual photon can be understood entirely in terms of the standard `naive' quark--parton model box approach. Thus the QCD renormalization group (RG) improved parton distributions of virtual photons, in particular their gluonic component, have not yet been observed. The appropriate kinematical regions for their future observation are pointed out as well as suitable measurements which may demonstrate their relevance.
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