Variational Approach to Strong-Coupling Quantum Chromodynamics

1979 ◽  
Vol 43 (10) ◽  
pp. 665-668 ◽  
Author(s):  
Tohru Eguchi ◽  
Spenta Wadia
Keyword(s):  
Quantum Chromodynamics ◽  
Strong Coupling ◽  
Variational Approach

scholarly journals REVIEW ON THE DETERMINATION OF αs FROM THE QCD STATIC ENERGY

2013 ◽  
Vol 28 (33) ◽  
pp. 1330028 ◽  
Author(s):  
XAVIER GARCIA i TORMO
Keyword(s):  
Quantum Chromodynamics ◽  
Strong Coupling ◽  
Lattice Data ◽  
Static Energy

We review the determination of the strong coupling αs from the comparison of the perturbative expression for the Quantum Chromodynamics static energy with lattice data. Here, we collect all the perturbative expressions needed to evaluate the static energy at the currently known accuracy.

Comparison of coupling constant by using momentum spectra and event shape variables in different interactions

2020 ◽  
Vol 98 (10) ◽  
pp. 900-906
Author(s):  
R. Saleh-Moghaddam ◽  
M.E. Zomorrodian
Keyword(s):  
Quantum Chromodynamics ◽  
Strong Coupling ◽  
Event Shape ◽  
Coupling Constant ◽  
Main Text ◽  
Shape Distribution ◽  
Electron Positron ◽  
Momentum Spectra ◽  
Dispersive Model ◽  
Event Shape Distribution

We describe in this paper the quantum chromodynamics prediction to calculate the strong coupling constant by using event shape variables as well as momentum spectra. By fitting the dispersive model and employing our parameters on event shape distribution, we obtain the perturbative value of [Formula: see text] = 0.1305 ± 0.0474 and also the non-perturbative value of α0 = 0.5246 ± 0.0516 GeV for electron–proton interactions. Next, by using momentum spectra for the same interactions, we obtain αs = 0.1572 ± 0.029. Our values in both methods are consistent with those obtained from electron–positron annihilations measured previously. When we find coupling constant for different flavours, we observe that they do not affect our results considerably. This is in accordance with quantum chromodynamics theory. All these features will be explained in the main text.

scholarly journals QCD, with strings attached

2016 ◽  
Vol 25 (10) ◽  
pp. 1630006 ◽  
Author(s):  
Alberto Güijosa
Keyword(s):  
String Theory ◽  
Quantum Chromodynamics ◽  
Large Class ◽  
Strong Coupling ◽  
Field Theories ◽  
Strong Coupling Regime ◽  
Efficient Tool ◽  
Strongly Coupled ◽  
Coupled Field ◽  
Gauge Gravity

In the nearly 20 years that have elapsed since its discovery, the gauge-gravity correspondence has become established as an efficient tool to explore the physics of a large class of strongly-coupled field theories. A brief overview is given here of its formulation and a few of its applications, emphasizing attempts to emulate aspects of the strong-coupling regime of quantum chromodynamics (QCD). To the extent possible, the presentation is self-contained, and does not presuppose knowledge of string theory.

Instantons as a bridge between weak and strong coupling in quantum chromodynamics

1979 ◽  
Vol 20 (12) ◽  
pp. 3279-3291 ◽  
Author(s):  
Curtis G. Callan ◽  
Roger F. Dashen ◽  
David J. Gross
Keyword(s):  
Quantum Chromodynamics ◽  
Strong Coupling

Strong-coupling field theory. I. Variational approach toφ4theory

1976 ◽  
Vol 14 (2) ◽  
pp. 487-516 ◽  
Author(s):  
Sidney D. Drell ◽  
Marvin Weinstein ◽  
Shimon Yankielowicz
Keyword(s):  
Field Theory ◽  
Strong Coupling ◽  
Variational Approach ◽  
Coupling Field

Tests of quantum chromodynamics and a direct measurement of the strong coupling constant αs at √s=30 GeV

1979 ◽  
Vol 89 (1) ◽  
pp. 139-144 ◽  
Author(s):  
D.P. Barber ◽  
U. Becker ◽  
H. Benda ◽  
A. Boehm ◽  
J.G. Branson ◽  
...  
Keyword(s):  
Quantum Chromodynamics ◽  
Strong Coupling ◽  
Direct Measurement ◽  
Strong Coupling Constant ◽  
Coupling Constant
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