Precise as determination from charmonium sum rules. BOITO, Diogo Rodrigues; MATEU, Vicent.
Abstract: The strong coupling, as, 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 as(mZ) 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(as2), 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(as3), is as(mZ)=0.1168±0.0019.
Physics Letters B
v. 806, p. 135482-1-135482-5 - Ano: 2020
Fator de Impacto: 4,162
@article={002997624,author = {BOITO, Diogo Rodrigues; MATEU, Vicent.},title={Precise as determination from charmonium sum rules},journal={Physics Letters B},note={v. 806, p. 135482-1-135482-5},year={2020}}
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Abstract: The strong coupling, as, 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 as(mZ) 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(as2), 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(as3), is as(mZ)=0.1168±0.0019.
@article={002997624,author = {BOITO, Diogo Rodrigues; MATEU, Vicent.},title={Precise as determination from charmonium sum rules},journal={Physics Letters B},note={v. 806, p. 135482-1-135482-5},year={2020}}