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• W2898853237 abstract "One of the main sources of theoretical uncertainty in the extraction of the strong coupling from hadronic tau decays stems from the renormalization-group improvement of the series. Perturbative series in QCD are divergent but are (most likely) asymptotic expansions. One needs knowledge about higher orders to be able to choose the optimal renormalization-scale setting procedure. Here, we discuss the use of Pad'e approximants as a model-independent and robust method to extract information about the higher-order terms. We show that in hadronic $tau$ decays the fixed-order expansion, known as fixed-order perturbation theory (FOPT), is the most reliable mainstream method to set the scale. This fully corroborates previous conclusions based on the available knowledge about the leading renormalon singularities of the perturbative series." @default.
• W2898853237 created "2018-11-09" @default.
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• W2898853237 date "2018-11-05" @default.
• W2898853237 modified "2023-09-26" @default.
• W2898853237 title "Renormalization-group improvement in hadronic $tau$ decays in 2018" @default.
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• W2898853237 doi "https://doi.org/10.48550/arxiv.1811.01601" @default.
• W2898853237 hasPublicationYear "2018" @default.
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