Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-06-18
Phys.Lett. B320 (1994) 186-192
Physics
High Energy Physics
High Energy Physics - Phenomenology
PRA-HEP/93-07, Latex, 10 pages and 5 Postscript figures in 2 PS files appended at the end of Tex file
Scientific paper
10.1016/0370-2693(94)90844-3
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 Weizs\"acker-Williams approximation, in ep interactions.
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