Simple analytic QCD model with perturbative QCD behavior at high momenta

Details Simple analytic QCD model with perturbative QCD behavior at high momenta Simple analytic QCD model with perturbative QCD behavior at high momenta

2010-06-25

arxiv.org/abs/1006.5050v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 4 figures, modified title, added discussions, updated BjPSR data used, added references [20,22-27,28b,29-30,32,35,45

Scientific paper

Analytic QCD models are those where the QCD running coupling has the physically correct analytic behavior, i.e., no Landau singularities in the Euclidean regime. We present a simple analytic QCD model in which the discontinuity function of the running coupling at high momentum scales is the same as in perturbative QCD (just like in the analytic QCD model of Shirkov and Solovtsov), but at low scales it is replaced by a delta function which parametrizes the unknown behavior there. We require that the running coupling agree to a high degree with the perturbative coupling at high energies, which reduces the number of free parameters of the model from four to one. The remaining parameter is fixed by requiring the reproduction of the correct value of the semihadronic tau decay ratio.

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