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- W3104756294 abstract "In quantum theory, physical amplitudes are usually presented in the form of Feynman perturbation series in powers of coupling constant $al .$ However, it is known that these amplitudes are not regular functions at $alpha=0 .$ For QCD, we propose new sets of expansion parameters ${bf w}_k(as)$ that reflect singularity at $as=0 $ and should be used instead of powers $as^k.$ Their explicit form is motivated by the so called Analytic Perturbation Theory. These parameters reveal saturation in a strong coupling case at the level $as^{eff}(asgg1)={bf w}_1(asgg 1) sim 0.5 .$ They can be used for quanitative analysis of divers low-energy amplitudes. We argue that this new picture with non-power sets of perturbation expansion parameters, as well as the saturation feature, is of a rather general nature." @default.
- W3104756294 created "2020-11-23" @default.
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- W3104756294 date "2008-11-01" @default.
- W3104756294 modified "2023-10-17" @default.
- W3104756294 title "Novel sets of coupling expansion parameters for low-energy pQCD" @default.
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- W3104756294 doi "https://doi.org/10.1134/s1547477108060010" @default.
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