Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analysis of $\alpha_s$ from the realization of quark-hadron duality   We present an analysis of the role of the running coupling constant at the
intersection of perturbative and nonperturbative QCD in the context of the
quark-hadron duality \`a la Bloom-Gilman. Our framework will be the unpolarized
structure function of the proton in the resonance region. We suggest that the
realization of duality is related to the inclusion of nonperturbative effects
at the level of the coupling constant. The outcome of our analysis is a smooth
transition from perturbative to nonperturbative QCD physics, embodied in the
running of the coupling constant at intermediate scales.

15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics