Abstract
Selected, recent, high energy results, primarily from collider experiments but including some fixed target experiments, are presented as illustrations of the status of Quantum ChromoDynamics (QCD). The concepts of leading order (LO) and next-to-leading order (NLO) QCD are introduced. Inclusive pp jet production as a function of jet transverse energy and cone size and di-jet angular distributions are shown to be in reasonable agreement with QCD. Jet shapes from pp, ep, and e+e− colliders are also compared to NLO QCD. Discrepancies between NLO calculations and data are apparent for measurements which involve a clearly identified final state parton. This is demonstrated by an unexpectedly large ratio of W+1-jet production to W+0-jet production and an unexpectedly large b-quark cross section in pp scattering. Similarly, a compilation of pp, pp, and fixed target scattering results shows prompt photon production to be systematically greater than NLO predictions. Measurements of the Casimir color factors and...
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