Analytic Perturbation Theory Model for QCD and Upsilon Decay
نویسندگان
چکیده
منابع مشابه
Analytic Perturbation Theory Model for QCD and Upsilon Decay
An elegant and more precise (Denominator) formula for the 3-loop perturbative QCD coupling is discussed. It improves the common expression (e.g., canonized by PDG) in few GeV region. On its base, we propose simple analytic Model for ghostfree QCD running couplings and their effective powers within the Analytic Perturbation Theory, in both the space-like (Euclidean) and time-like (Minkowskian) r...
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The connection between ghost–free formulations of RG–invariant perturbation theory in the both Euclidean and Minkowskian regions is investigated. Our basic tool is the “double spectral representation”, similar to the definition of Adler function, that stems from first principles of local QFT. It relates real functions defined in the Euclidean and Minkowskian regions. On this base we establish a...
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We discuss the resummation approach in QCD Analytic Perturbation Theory (APT). We start with a simple example of asymptotic power series for a zero-dimensional analog of the scalar g φ4 model. Then we give a short historic preamble of APT and show that renormgroup improvement of the QCD perturbation theory dictates to use the Fractional APT (FAPT). After that we discuss the (F)APT resummation o...
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Here, we report briefly two topics: 1) The latest version of “Analytic Perturbation Theory” (APT) devised recently for the QCD observables both in the Euclidean and Minkowskian regions. 2) Results of the APT–based calculation for some physical processes. 1 The APT — a closed theoretical scheme The new APT version [1, 2] mutually relates two ghost–free formulations of modified perturbation expan...
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N. G. Stefanis, A. P. Bakulev, A. I. Karanikas, S. V. Mikhailov, Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44780 Bochum, Germany Email: [email protected] Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, Russia Email: [email protected] Email: [email protected] University of Athens, Department of Physics, Nuclear and Particle Physics Se...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2006
ISSN: 0920-5632
DOI: 10.1016/j.nuclphysbps.2006.09.061