Search for evidence of photoproduction of higher-twist QCD events at Experiment 683 at Fermi National Accelerator Laboratory

摘要

Experiment 683 at Fermilab Wide Band Photon Laboratory observed events via $\gamma\rm p\to$ jets during the 1991-1992 fixed target run. The present analysis attempted to observe the higher-twist subprocess in QCD using that data to measure the p$\sb{\perp}$ spectrum via a clustering algorithm tuned to optimize the distinctive topology of higher-twist events. Results indicate a substantial k$\sb{\perp}$ promotion effect at lower p$\sb{\perp}$ and a significant NLO contribution to the photoproduction.