Novel Sets of Coupling Expansion Parameters for low-energy pQCD
| dc.creator | Shirkov, D. V. | |
| dc.date | 2008-04-01 | |
| dc.date.accessioned | 2026-07-07T12:14:21Z | |
| dc.date.available | 2026-07-07T12:14:21Z | |
| dc.description | 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 $α=0 .$ 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 $\as^{eff}(\as\gg1)={\bf w}_1(\as\gg 1) \sim 0.5 .$ 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. | |
| dc.description | 8 pages, 1 figure, submitted to Part. Nucl. Phys. Lett | |
| dc.identifier | https://arxiv.org/abs/0804.0083 | |
| dc.identifier | http://arxiv.org/abs/0804.0083 | |
| dc.identifier | Phys.Part.Nucl.Lett.5:489-493,2008 | |
| dc.identifier | doi:10.1134/S1547477108060010 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/211162 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Novel Sets of Coupling Expansion Parameters for low-energy pQCD | |
| dc.type | text |