What is the Real K Factor?

Details What is the Real K Factor? What is the Real K Factor?

2002-07-30

arxiv.org/abs/hep-ph/0207359v1

Heavy Ion Phys. 17 (2003) 75

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, uses special included style file, 14 eps figures, submitted to Heavy Ion Physics

Scientific paper

The theoretical K factor, describing the difference between the leading and higher order cross sections, has no precise definition. The definition is sensitive to the order of the fit to the parton densities and the number of loops at which alpha_s is evaluated. We describe alternate ways to define the K factor and show how the definition affects its magnitude and shape for examples of hadroproduction of W^+ bosons, Drell-Yan lepton pairs, and heavy quarks. We discuss which definition is appropriate under certain circumstances.

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