Virtual photon structure to non-leading order in QCD

T. Uematsu, T. F. Walsh

Research output: Contribution to journalArticlepeer-review

73 Scopus citations


We investigate the virtual photon structure functions for Λ2 ≪ P2 ≪ Q2, where -Q2 (-P2) is the mass squared of the probe (target) photon. We do this to next-to-leading order in QCD. The non-leading corrections significantly modify the leading log result, in particular at large x. Also, the perturbatively calculated structure function is positive at low x even for P2 ≈ 1 GeV2. (For a real photon target it becomes negative at low x.) For large P2 the QCD result approaches the box diagram (Born) structure function also when non-leading contributions are included. It is, however, important to include the large non-leading box diagram contributions in making this comparison.

Original languageEnglish (US)
Pages (from-to)93-118
Number of pages26
JournalNuclear Physics, Section B
Issue number1
StatePublished - May 17 1982

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