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SUMMARY:A new RG-summation method for extraction of  &#945\;s(M&#964\;) fr
 om hadronic tau decays
DTSTART;VALUE=DATE-TIME:20120503T100000Z
DTEND;VALUE=DATE-TIME:20120503T110000Z
DTSTAMP;VALUE=DATE-TIME:20260611T012911Z
UID:indico-event-1853@indico.ific.uv.es
DESCRIPTION:We provide a new determination of strong coupling αs(Mτ) usi
 ng an improved fixed-order perturbation theory based on the explicit summa
 tion of all renormalization-group accessible logarithms\, proposed some ti
 me ago in the literature. In this approach\, the powers of the coupling in
  the expansion of the QCD Adler function are multiplied by a set of functi
 ons Dn \, which depend themselves on the coupling and can be written in a 
 closed form by iteratively solving a sequence of differential equations. W
 e find that the new expansion has an improved behaviour in the complex ene
 rgy plane compared to that of the standard fixed-order perturbation theory
  (FOPT)\, and is similar but not identical to the contour-improved perturb
 ation theory (CIPT). With five terms in the perturbative expansion we obta
 in in the MS scheme αs(Mτ) = 0.338 ± 0.010.\n\nhttps://indico.ific.uv.e
 s/event/1853/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1853/
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