| Full text | |
| Author(s): |
Boito, Diogo
;
Jamin, Matthias
;
Miravitllas, Ramon
Total Authors: 3
|
| Document type: | Journal article |
| Source: | Physical Review Letters; v. 117, n. 15 OCT 3 2016. |
| Web of Science Citations: | 11 |
| Abstract | |
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) | |
| FAPESP's process: | 15/20689-9 - Precise determination of fundamental QCD parameters |
| Grantee: | Diogo Rodrigues Boito |
| Support Opportunities: | Research Grants - Young Investigators Grants |