Nonlinear Phenomena in Complex Systems, 2008, Vol.11, No.3, pp.367-372

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2008, Vol.11, No.3, pp.367-372

Renormalization Scheme Dependence of Physical Observables within Variational Perturbation Theory.
L. D. Korsun, , and O. P. Solovtsova

We develop the nonperturbative approach to QCD and apply it to the process of e⁺e^- annihilation into hadrons to study the renormalization scheme dependence of the R(s) cross-section ratio. We show that the scheme dependence in the framework of this approach is considerably less then in standard perturbative theory and predictions have practically no scheme arbitrariness in the entire energy range.
Key words: quantum chromodynamics, nonperturbative methods, strong-coupling expansions, electron-positron annihilation into hadrons

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