PT Journal
AU Courtoy, A
   Scopetta, S
   Vento, V
TI Non-perturbative momentum dependence of the coupling constant and hadronic models
SO European Physical Journal A
JI Eur. Phys. J. A
PY 2011
BP 49
EP 7pp
VL 47
IS 4
DI 10.1140/epja/i2011-11049-8
LA English
AB 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.
ER