Recent progress in hadronic tau decays

Details Recent progress in hadronic tau decays Recent progress in hadronic tau decays

2011-01-04

arxiv.org/abs/1101.0681v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 3 figures. Talk presented at 11th International Workshop on Tau Lepton Physics, Manchester, UK, 13-17 September 2010

Scientific paper

The determination of alpha_s from hadronic tau decays is impeded by the fact that two choices for the renormalisation group resummation, namely fixed-order (FOPT) and contour-improved perturbation theory (CIPT), yield systematically differing results. On the basis of a model for higher-order terms in the perturbative series, which incorporates well-known structure from renormalons, it is found that FOPT smoothly approaches the Borel sum for the tau hadronic width, while CIPT is unable to account for the resummed series. An example for the behaviour of QCD spectral function moments, displaying a similar behaviour, is presented as well.

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