scholarly journals Precise determination of the strong coupling constant inNf= 2+1 lattice QCD with the Schrödinger functional scheme

2009 ◽  
Vol 2009 (10) ◽  
pp. 053-053 ◽  
Author(s):  
PACS-CS collaboration ◽  
S Aoki ◽  
K.-I Ishikawa ◽  
N Ishizuka ◽  
T Izubuchi ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Strong Coupling ◽  
Precise Determination ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Functional Scheme

scholarly journals Precise determination of αS( $ m_{Z^0 } $ ) from a global fit of energy-energy correlations to NNLO+NNLL predictions

2019 ◽  
Vol 206 ◽  
pp. 05002
Author(s):  
A. Kardos ◽  
S. Kluth ◽  
G. Somogyi ◽  
Z. Tulipánt ◽  
A. Verbytskyi
Keyword(s):  
Strong Coupling ◽  
Precise Determination ◽  
Strong Coupling Constant ◽  
Final States ◽  
Leading Order ◽  
Coupling Constant ◽  
Global Fit ◽  
Hadronic Final States

We present a determination of the strong coupling constant αS( $ m_{Z^0 } $ ) using a global fit of theory predictions in next-to-next-next-leading-order (NNLO) combined with resummed predictions at the next-to-next-leading-log level (NNLL) [bibrR11]. The predictions are compared to distributions of energy-energy correlations measured in e+e−annihilation to hadronic final states by experiments at the e+e−colliders LEP, PETRA, TRISTAN and PEP. The predictions are corrected for hadronisation effects using the modern generator programs Sherpa 2.2.4 and Herwig 7.1.1.

scholarly journals Determination of the Strong Coupling Constant by the ALPHA Collaboration

2018 ◽  
Vol 175 ◽  
pp. 01018 ◽  
Author(s):  
Tomasz Korzec
Keyword(s):  
Strong Coupling ◽  
Gradient Flow ◽  
Mass Scale ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Intermediate Energies ◽  
Precision Determination ◽  
Functional Scheme ◽  
High Precision Determination

A high precision determination of the strong coupling constant in the MS scheme at the Z-mass scale, using low energy quantities, namely pion/kaon decay constants and masses, as experimental input is presented. The computation employs two different massless finite volume renormalization schemes to non-perturbatively trace the scale dependence of the respective running couplings from a scale of about 200 MeV to 100 GeV. At the largest energies perturbation theory is reliable. At high energies the Schrödinger-Functional scheme is used, while the running at low and intermediate energies is computed in a novel renormalization scheme based on an improved gradient flow. Large volume Nf = 2 + 1 QCD simulations by CLS are used to set the overall scale. The result is compared to world averages by FLAG and the PDG.

Comparison of e+e− annihilation with QCD and determination of the strong coupling constant

1980 ◽  
Vol 94 (3) ◽  
pp. 437-443 ◽  
Author(s):  
R. Brandelik ◽  
W. Braunschweig ◽  
K. Gather ◽  
V. Kadansky ◽  
K. Lübelsmeyer ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Strong Coupling Constant ◽  
Coupling Constant

scholarly journals Manifestation of Sea Quark Effects in the Strong Coupling Constant in Lattice QCD

1995 ◽  
Vol 74 (1) ◽  
pp. 22-25 ◽  
Author(s):  
S. Aoki ◽  
M. Fukugita ◽  
S. Hashimoto ◽  
N. Ishizuka ◽  
H. Mino ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Strong Coupling ◽  
Strong Coupling Constant ◽  
Coupling Constant
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