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• W1971764240 abstract "The new result for the third-order QCD corrections to R_{e^+e^-}, unlike the old, incorrect result, is nicely compatible with the principle-of-minimal-sensitivity optimization method. Moreover, it leads to infrared fixed-point behaviour: the optimized couplant, alpha_s/pi, for R(e+e-) does not diverge at low energies, but freezes to a value 0.26 below about 300 MeV. This provides some direct theoretical evidence, purely from perturbation theory, for the freezing of the couplant -- an idea that has long been a popular and successful phenomenological hypothesis. We use the smearing method of Poggio, Quinn, and Weinberg to compare the resulting theoretical prediction for R(e+e-) with experimental data down to the lowest energies, and find excellent agreement." @default.
• W1971764240 created "2016-06-24" @default.
• W1971764240 creator A5012104701 @default.
• W1971764240 creator A5084750123 @default.
• W1971764240 date "1994-01-01" @default.
• W1971764240 modified "2023-10-04" @default.
• W1971764240 title "Optimization of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant=italic>R</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=italic>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=italic>e</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal…" @default.
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• W1971764240 doi "https://doi.org/10.1103/physrevd.49.437" @default.
• W1971764240 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10016781" @default.
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