Higher-twist contributions to F_L and F₂ from instantons

2000/06/21 by B. Dressler, Dressler, B., M. Maul +4
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0006252

4 pages, LaTeX, uses sprocl.sty. Contribution to Proceedings of DIS 2000, Liverpool, April 25 - 30, 2000

arxiv created 2000/06/21 · arxiv updated 2009/11/30

Abstract

We study the twist-4 contribution to the unpolarized nucleon structure functions, F_L and F₂, in an approach where the vacuum structure of QCD is described by a dilute medium of instantons (ρ/ R ≪ 1). The dominant power corrections come from the twist-4 quark-gluon operators and are of the order 1/(ρ² Q²). The contributions from four-quark operators are suppressed. The approach predicts large 1/Q²-corrections to F_L, in agreement with the results of QCD fits to the data.

Related

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• Higher Twist contributions to the Structure Functions F₂(x,Q²) and g₂(x,Q²)