Strong coupling from the τ-lepton hadronic width

0469819 - FZÚ 2017 RIV IT eng C - Konferenční příspěvek (zahraniční konf.)
Abbas, G. - Ananthanarayan, B. - Caprini, I. - Fischer, Jan
Strong coupling from the τ-lepton hadronic width.
Proceedings of Science. The European Physical Society Conference on High Energy Physics. Trieste: Proceedings of Science, 2013, s. 1-7, č. článku 413. ISSN 1824-8039.
[The European Physical Society Conference on High Energy Physics. Stockholm (SE), 18.07.2013-24.07.2013]
Institucionální podpora: RVO:68378271
Klíčová slova: 12.38.Cy * 13.35.Dx * 11.10 Hi
Kód oboru RIV: BE - Teoretická fyzika

The strong coupling is determined using a novel renormalization-group-summed perturbation theory and a non power renormalization-group-summed perturbation theory with a tamed large-order behaviour. In this talk, the main features of these two schemes are presented and are applied to the extraction of from the hadronic decay width of the τ lepton. While the renormalization-group-summed perturbation theory leads to a value of strong coupling close to that from contour- improved perturbation theory, the non power normalization-group-summed perturbation theory yields a value closer to the standard fixed-order perturbation theory.
Trvalý link: http://hdl.handle.net/11104/0267608