Journal
PHYSICAL REVIEW D
Volume 78, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.78.071902
Keywords
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Funding
- RFBR [08-01-00686, 06-02-16215, 07-02-91557, 08-02-00896-a]
- JINR-Belorussian [F08D-001]
- RF Scientific School [1027.2008.2.]
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The reasonableness of the use of perturbative QCD notions in the region close to the scale of hadronization, i.e., below less than or similar to 1 GeV is under study. First, the interplay between higher orders of pQCD expansion and higher-twist contributions in the analysis of recent Jefferson Lab (JLab) data on the generalized Bjorken sum rule function Gamma(p-n)(1)(Q(2)) at 0.1 < Q(2)< 3 GeV2 is studied. It is shown that the inclusion of the higher-order pQCD corrections could be absorbed, with good numerical accuracy, by change of the normalization of the higher-twist terms. Second, to avoid the issue of unphysical singularity (Landau pole at Q=Lambda similar to 400 MeV), we deal with the ghost-free analytic perturbation theory (APT) that recently proved to be an intriguing candidate for a quantitative description of light quarkonia spectra within the Bethe-Salpeter approach. The values of the twist coefficients mu(2k) extracted from the mentioned data by using the APT approach provide a better convergence of the higher-twist series than with the common pQCD. As the main result, a good quantitative description of the JLab data down to Q similar or equal to 350 MeV is achieved.
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