An approach for evaluation of observables in analytic versions of QCD

Details An approach for evaluation of observables in analytic versions of QCD An approach for evaluation of observables in analytic versions of QCD

2006-01-06

arxiv.org/abs/hep-ph/0601050v3

J.Phys. G32 (2006) L27

Physics

High Energy Physics

High Energy Physics - Phenomenology

revtex4, 8 pages, two eps-figures; one reference added; no other changes; version to appear in J. Phys. G

Scientific paper

10.1088/0954-3899/32/6/L01

We present two variants of an approach for evaluation of observables in analytic QCD models. The approach is motivated by the skeleton expansion in a certain class of schemes. We then evaluate the Adler function at low energies in one variant of this approach, in various analytic QCD models for the coupling parameter, and compare with perturbative QCD predictions and the experimental results. We introduce two analytic QCD models for the coupling parameter which reproduce the measured value of the semihadronic tau decay ratio. Further, we evaluate the Bjorken polarized sum rule at low energies in both variants of the evaluation approach, using for the coupling parameter the analytic QCD model of Shirkov and Solovtsov, and compare with values obtained by the evaluation approach of Milton et al. and Shirkov.

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