A modification of contour-improved perturbation theory

Gorazd Cvetič, Marcelo Loewe, Cristian V. Martínez, Cristián Valenzuela

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We present a modification of the standard method of evaluating the semihadronic tau decay width. The method is based on a derivative expansion for the Adler function rather than the standard series in powers of the strong coupling. The extracted QCD coupling at the tau mass scale is by 2% lower than the "contour improved" value. We find αs(MZ2)=0.1211±0.0010.

Original languageEnglish
Pages (from-to)152-155
Number of pages4
JournalNuclear Physics B - Proceedings Supplements
Issue number1 C
StatePublished - Oct 2010


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