Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-03-10
Phys.Lett.B681:336-342,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 4 tables. Revised and extended version accepted for publication in PLB. References and a note on quark mass effects a
Scientific paper
10.1016/j.physletb.2009.10.030
We introduce the minimal momentum subtraction (MiniMOM) scheme for QCD. Its definition allows the strong coupling to be fixed solely through a determination of the gluon and ghost propagators. In Landau gauge this scheme has been implicit in the early studies of these propagators, especially in relation to their non-perturbative behaviour in the infrared and the associated infrared fixed-point. Here we concentrate on its perturbative use. We give the explicit perturbative definition of the scheme and the relation of its beta-function and running coupling to the MSbar scheme up to 4-loop order in general covariant gauges. We also demonstrate, by considering a selection of N_f=3 examples, that the apparent convergence of the relevant perturbative series can in some (though not all) cases be significantly improved by re-expanding the MSbar coupling version of this series in terms of the MiniMOM coupling, making the MiniMOM coupling also of potential interest in certain phenomenological applications.
Maltman Kim
Smekal Lorenz von
Sternbeck André
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