Direct vs. resolved photon: an exercise in factorization

Abstract

Direct and resolved photon interactions are shown to be intimately related through the factorization mechanism. It is argued that in theoretically consistent analysis of jet production in $\gamma$p and ep collisions the LO resolved $\gamma$ contribution must be considered together with the NLO direct $\gamma$ component. Recent data from HERA therefore do not provide a direct evidence for the former component, but should rather be interpreted as a manifestation of the $O(\alpha {\alpha }_s^2)$ term in $\gamma$p and, via the Weizsäcker-Williams approximation, in ep interactions.

PRA-HEP/93-07, Latex, 10 pages and 5 Postscript figures in 2 PS files appended at the end of Tex file

References in corpus (1)

• On parton distributions beyond the leading order

Cited by in corpus (4)

• Study of the photon remnant in resolved photoproduction at HERA
• Low Q^2 Jet Production at HERA and Virtual Photon Structure
• High Energy Photoproduction
• Photon Structure and Quantum Fluctuation