Non-perturbative momentum dependence of the coupling constant and hadronic models

[en] 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. © 2011 SIF, Springer-Verlag Berlin Heidelberg.

Disciplines :

Physics

Author, co-author :

Courtoy, Aurore ; INFN, Sezione di Pavia, Pavia, Italy

Scopetta, S.; Dipartimento di Fisica, Università degli Studi di Perugia, and INFN, Sezione di Perugia, via A. Pascoli, 06100 Perugia, Italy

Vento, V.; Departamento de Física Teórica, Instituto de Física Corpuscular, Universidad de Valencia-CSIC, E-46100 Burjassot (Valencia), Spain

Language :

English

Title :

Non-perturbative momentum dependence of the coupling constant and hadronic models

Publication date :

2011

Journal title :

European Physical Journal. A, Hadrons and Nuclei

ISSN :

1434-6001

eISSN :

1434-601X

Publisher :

Springer, New York, United States - New York

Volume :

Issue :

Pages :

1-7

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 11 July 2012

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