2001Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fieldsOpen access

Has the QCD renormalization-group-improved parton content of virtual photons been observed?

M. Glück, E. Reya, I. Schienbein

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Abstract

It is demonstrated that present ${e}^{+}{e}^{\ensuremath{-}}$ and DIS $\mathrm{ep}$ 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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What this paper is about

It is demonstrated that present ${e}^{+}{e}^{\ensuremath{-}}$ and DIS $\mathrm{ep}$ 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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Available abstract

It is demonstrated that present ${e}^{+}{e}^{\ensuremath{-}}$ and DIS $\mathrm{ep}$ 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.

Key concepts: Parton, Particle physics, Quantum chromodynamics, Virtual particle, Photon, Physics, Renormalization group, Content (measure theory)

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