Non-perturbative momentum dependence of the coupling constant and hadronic models |
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Authors: | A Courtoy S Scopetta V Vento |
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Institution: | 1.INFN, Sezione di Pavia,Pavia,Italy;2.Dipartimento di Fisica,Università degli Studi di Perugia, and INFN, Sezione di Perugia,Perugia,Italy;3.Departamento de F?sica Teórica and Instituto de F?sica Corpuscular,Universidad de Valencia-CSIC,Burjassot (Valencia),Spain |
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Abstract: | Models of hadron structure are associated with a hadronic scale which allows by perturbative evolution to calculate observables
in the deep inelastic region. The resolution of Dyson-Schwinger equations leads to the freezing of the QCD running coupling
(effective charge) in the infrared, which is best understood as a dynamical generation of a gluon mass function, giving rise
to a momentum dependence which is free from infrared divergences. We use this new development to understand why perturbative
treatments are working reasonably well despite the smallness of the hadronic scale. |
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Keywords: | |
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