Počet záznamů: 1

New perturbation expansions in quantum chromodynamics and the determination of alpha(s)

  1. 1.
    0356868 - FZU-D 2011 RIV RO eng J - Článek v odborném periodiku
    Caprini, I. - Fischer, Jan
    New perturbation expansions in quantum chromodynamics and the determination of alpha(s).
    Romanian Journal of Physics. Roč. 55, 5-6 (2010), s. 527-537 ISSN 1221-146X
    Grant CEP: GA MŠk LC527; GA MŠk LA08015
    Výzkumný záměr: CEZ:AV0Z10100502
    Klíčová slova: quantum chromodynamics * conformal mapping * tau lepton decay
    Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
    Impakt faktor: 0.340, rok: 2010

    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.
    Trvalý link: http://hdl.handle.net/11104/0195277