Reference : The Strong Coupling Constant from Hadron Structure Phenomenology
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The Strong Coupling Constant from Hadron Structure Phenomenology
Courtoy, Aurore mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules >]
Liuti, Simonetta [University of Virginia > Department of Physics > > >]
International Journal of Modern Physics Conference Series
World Scientific Publishing Company
QCD Evolution Workshop (QCD 2012)
14-17 May 2012
JLab, Newport News, VA
[en] We present recent developments on the role of the running coupling constant at the intersection of perturbative and nonperturbative QCD. A number of experiments show a smooth transition from small to large scales given by the four-momentum transfer in the reactions. This is at variance with perturbative QCD where the running coupling constant becomes infinite when the scale equals ΛQCD. Approaches using an effective coupling constant could help interpret the opposite trend of data as compared to standard perturbative QCD predictions. We give an overview of the role of the coupling constant in the procedure to match nonperturbative hadronic model to perturbative QCD and we propose an extraction of an effective coupling constant from inclusive electron proton scattering data at large Bjorken x.

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