Bound state approach to the QCD coupling at low energy scales
| Autor: | Baldicchi, M., Nesterenko, A. V., Prosperi, G. M., Shirkov, D. V., Simolo, C. |
|---|---|
| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Phys.Rev.Lett.99:242001,2007 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.99.242001 |
| Popis: | We exploit theoretical results on the meson spectrum within the framework of a Bethe-Salpeter (BS) formalism adjusted for QCD, in order to extract an ``experimental'' coupling \alpha_s^{exp}(Q^2) below 1 GeV by comparison with the data. Our results for \alpha_s^{exp}(Q^2) exhibit a good agreement with the infrared safe Analytic Perturbation Theory (APT) coupling from 1 GeV down to 200 MeV. As a main result, we claim that the combined BS-APT theoretical scheme provides us with a rather satisfactory correlated understanding of very high and low energy phenomena. Comment: Revised version, to appear on Physical Review Letters. 7 pages, 2 figures, Revtex |
| Databáze: | arXiv |
| Externí odkaz: |
|