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New perturbation expansions in quantum chromodynamics and the determination of alpha(s)
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SYSNO ASEP 0356868 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title New perturbation expansions in quantum chromodynamics and the determination of alpha(s) Author(s) Caprini, I. (RO)
Fischer, Jan (FZU-D) RIDSource Title Romanian Journal of Physics. - : Publishing House of the Romanian Academy - ISSN 1221-146X
Roč. 55, 5-6 (2010), s. 527-537Number of pages 11 s. Language eng - English Country RO - Romania Keywords quantum chromodynamics ; conformal mapping ; tau lepton decay Subject RIV BF - Elementary Particles and High Energy Physics R&D Projects LC527 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LA08015 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z10100502 - FZU-D (2005-2011) UT WOS 000280968300007 EID SCOPUS 77955495749 Annotation We consider a new class of perturbation expansions which in a systematic way incorporate the available information about the divergent character of the perturbation series in QCD. The new expansion functions, which replace the powers of the coupling, are defined by the analytic continuation in the Borel plane, achieved through an optimal conformal mapping. We consider several possibilities of implementing the known behaviour of the Borel transform, which have the same convergence rate, but differ at low orders. The new expansions allow a precise determination of the strong coupling $/alpha_s$ from the hadronic decays of the tau lepton. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2011
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