On the running coupling constant in QCD
By G. Prosperi, M. Raciti, C. Simolo. 2006
135 citations recorded by the source corpus.
Abstract We try to review the main current ideas and points of view on the running coupling constant in QCD. We begin by recalling briefly the classic analysis based on the Renormalization Group Equations with some emphasis on the exact solutions for a given number of loops, in comparison with the usual approximate expressions. We give particular attention to the problem of eliminating the unphysical Landau singularities, and of defining a coupling that remains significant at infrared scales. We consider various proposals for couplings directly related to the quark–antiquark potential or to other physical quantities (effective charges) and discuss optimization in the choice of the scale parameter and of the renormalization scheme. Our main focus is, however, on dispersive methods, their application and their relation with non-perturbative effects. We try also to summarize the main results obtained by Lattice simulations, in particular various MOM schemes. We conclude by briefly recalling the traditional comparisons with experimental data.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/fa2db044a4a2d6e4561fa894ce776daa6d7903ef
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Nuclear and High Energy Physics
Citations in the corpus
- The QCD running coupling (2016, background): “The procedure described above is extendable to higher orders, [2, 365], with the same caveat as for the perturbative coupling: the solutions for β2 and higher orders are either numerical or approximately analytic solutions.”