PQCD Analysis of Parton-Hadron Duality

Abstract

We propose an extraction of the running coupling constant of QCD in the infrared region from experimental data on deep inelastic inclusive scattering at Bjorken x -> 1. We first attempt a perturbative fit of the data that extends NLO PQCD evolution to large x values and final state invariant mass, W, in the resonance region. We include both target mass corrections and large x resummation effects. These effects are of order O(1/Q^2), and they improve the agreement with the Q^2 dependence of the data. Standard analyses require the presence of additional power corrections, or dynamical higher twists, to achieve a fully quantitative fit. Our analysis, however, is regulated by the value of the strong coupling in the infrared region that enters through large x resummation effects, and that can suppress, or absorb, higher twist effects. Large x data therefore indirectly provide a measurement of this quantity that can be compared to extractions from other observables.

10 pages, 3 figures

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• Nonperturbative QCD Coupling and its $\beta$ function from Light-Front Holography
• Fully Unintegrated Parton Correlation Functions and Factorization in Lowest Order Hard Scattering
• Determination of the effective strong coupling constant alpha_{s,g_1}(Q^2) from CLAS spin structure function data
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Cited by in corpus (3)

• Extraction of ${\alpha }_s$ from deep inelastic scattering at large $x$
• Analysis of ${\alpha }_s$ from the realization of quark-hadron duality
• The role of the running coupling constant in the unveiling of the hadronic structure