Parametrization of the QCD coupling in the Evolution Equations

Details Parametrization of the QCD coupling in the Evolution Equations Parametrization of the QCD coupling in the Evolution Equations

2008-05-15

arxiv.org/abs/0805.2278v1

Phys.Lett.B666:256-261,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 4 figures

Scientific paper

10.1016/j.physletb.2008.07.056

We examine the parametrization of the QCD coupling in the Evolution Equations, including DGLAP. Our conclusion is that the well-known parametrization, where the argument of the coupling is k^2_{\perp}/\beta or just k^2_{\perp}, stands only if the lowest integration limit in the transverse momentum space (the starting point mu^2 of the Q^2 -evolution) obeys the relation mu >> Lambda_{QCD} \exp {(\pi/2)}, otherwise the coupling should be replaced by the more complicated expression presented in Eq. (37).

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