scholarly journals Measurement of the strong coupling constant $\alpha_{\rm s}$ and the vector and axial-vector spectral functions in hadronic tau decays

1999 ◽  
Vol 7 (4) ◽  
pp. 571-593 ◽  
Author(s):  
K. Ackerstaff et al. ◽  
Keyword(s):  
Strong Coupling ◽  
Axial Vector ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Spectral Functions ◽  
Tau Decays ◽  
Hadronic Tau

scholarly journals αs analyses from hadronic tau decays with OPAL and ALEPH data

2016 ◽  
Vol 31 (26) ◽  
pp. 1630024 ◽  
Author(s):  
Diogo Boito ◽  
Maarten Golterman ◽  
Kim Maltman ◽  
Santiago Peris
Keyword(s):  
Strong Coupling ◽  
Data Sets ◽  
Higher Dimension ◽  
Spectral Functions ◽  
Combined Analysis ◽  
Tau Decays ◽  
Opal Data ◽  
Self Consistent ◽  
Hadronic Tau

Recently, we extracted the strong coupling, [Formula: see text], from the revised ALEPH data for non-strange hadronic tau decays. Our analysis is based on a method previously used for the determination of the strong coupling from OPAL data. In our strategy, we employ different moments of the spectral functions both with and without pinching, including duality violations, in order to obtain fully self-consistent analyses that do not rely on untested assumptions (such as the smallness of higher dimension contributions in the operation product expansion (OPE)). Here we discuss the [Formula: see text] values obtained from the ALEPH and the OPAL data, the robustness of the analysis, as well as non-perturbative contributions from DVs and the OPE. We show that, although the [Formula: see text] determination is sound, non-perturbative effects limit the accuracy with which one can extract the strong coupling from tau decay data. Finally, we discuss the compatibility of the data sets and the possibility of a combined analysis.

scholarly journals On the Extraction of the Strong Coupling Constant from Hadronic Tau Decay

2012 ◽  
Author(s):  
James Osborne ◽  
Diogo Boito ◽  
Oscar Cata ◽  
Maarten Golterman ◽  
Matthias Jamin ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Hadronic Tau

scholarly journals DETERMINATION OF THE STRONG COUPLING FROM HADRONIC TAU DECAYS USING RENORMALIZATION GROUP SUMMED PERTURBATION THEORY

2013 ◽  
Vol 28 (24) ◽  
pp. 1360004 ◽  
Author(s):  
GAUHAR ABBAS ◽  
B. ANANTHANARAYAN ◽  
IRINEL CAPRINI
Keyword(s):  
Renormalization Group ◽  
Strong Coupling ◽  
Coupling Constant ◽  
Convergence Properties ◽  
Tau Decays ◽  
Higher Order Terms ◽  
Borel Transformation ◽  
Adler Function ◽  
Hadronic Tau

We determine the strong coupling constant αs from the τ hadronic width using a renormalization group summed (RGS) expansion of the QCD Adler function. The main theoretical uncertainty in the extraction of αs is due to the manner in which renormalization group invariance is implemented, and the as yet uncalculated higher order terms in the QCD perturbative series. We show that new expansion exhibits good renormalization group improvement and the behavior of the series is similar to that of the standard CIPT expansion. The value of the strong coupling in [Formula: see text] scheme obtained with the RGS expansion is [Formula: see text]. The convergence properties of the new expansion can be improved by Borel transformation and analytic continuation in the Borel plane. This is discussed elsewhere in these issues.

scholarly journals Drell-Yan Cross Section to Third Order in the Strong Coupling Constant

2020 ◽  
Vol 125 (17) ◽  
Author(s):  
Claude Duhr ◽  
Falko Dulat ◽  
Bernhard Mistlberger
Keyword(s):  
Strong Coupling ◽  
Cross Section ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Third Order
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