| Full text | |
| Author(s): |
Boito, Diogo
;
Mateu, Vicent
Total Authors: 2
|
| Document type: | Journal article |
| Source: | Physics Letters B; v. 806, p. 5-pg., 2020-07-10. |
| Abstract | |
The strong coupling, alpha(s), governs perturbative Quantum Chromodynamics (QCD) and is one of the free parameters of the Standard Model. We introduce a new method that allows a precise extraction of alpha(s)(m(Z)) from dimensionless ratios of roots of moments of the charm-quark vector correlator. The ratios we use in our analysis have a rather weak logarithmic quark-mass dependence, starting at O(alpha(2)(s)), and can be obtained from experimental data with good precision, since they benefit from positive correlations among the individual experimentally determined moments. We perform a careful and conservative error analysis with special emphasis on uncertainties related to the truncation of perturbation theory, treating the renormalization scales such as to ensure order-by-order convergence. Our final result, with expressions at O(alpha(3)(s)), is alpha(s)(m(Z)) = 0.1168 +/- 0.0019. (C) 2020 The Author(s). Published by Elsevier B.V. (AU) | |
| FAPESP's process: | 15/20689-9 - Precise determination of fundamental QCD parameters |
| Grantee: | Diogo Rodrigues Boito |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 18/14967-4 - High-precision determination of the charm and bottom quark masses |
| Grantee: | Diogo Rodrigues Boito |
| Support Opportunities: | Regular Research Grants |