| Texto completo | |
| Autor(es): |
Boito, Diogo
;
Jamin, Matthias
;
Miravitllas, Ramon
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physical Review Letters; v. 117, n. 15, p. 5-pg., 2016-10-03. |
| Resumo | |
The quantum chromodynamics (QCD) coupling alpha(s) is not a physical observable of the theory, since it depends on conventions related to the renormalization procedure. We introduce a definition of the QCD coupling, denoted by a (alpha) over cap (S), whose running is explicitly renormalization scheme invariant. The scheme dependence of the new coupling (alpha) over cap (S) is parametrized by a single parameter C, related to transformations of the QCD scale Lambda. It is demonstrated that appropriate choices of C can lead to substantial improvements in the perturbative prediction of physical observables. As phenomenological applications, we study e(+)e(-) scattering and decays of the tau lepton into hadrons, both being governed by the QCD Adler function. (AU) | |
| Processo FAPESP: | 15/20689-9 - Determinação precisa de parâmetros fundamentais da QCD |
| Beneficiário: | Diogo Rodrigues Boito |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |