scholarly journals The Bose-Einstein Correlations and the Strong Coupling Constant at Low Energies

Physics ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 59-66
Author(s):  
Gideon Alexander ◽  
Boris Blok
Keyword(s):  
Strong Coupling ◽  
Center Of Mass ◽  
Strong Coupling Constant ◽  
Theory Approach ◽  
Coupling Constant ◽  
Alternative Approach ◽  
Low Energies ◽  
Perturbative Regime ◽  
Bose Einstein ◽  
Short Range Correlations

It is shown that α s ( E ) , the strong coupling constant, can be determined in the non-perturbative regime from Bose-Einstein correlations (BEC). The obtained α s ( E ) , where E is the energy of the hadron in the center of mass reference frame of the di-hadron pair, is in agreement with the prescriptions dealt with in the Analytic Perturbative Theory approach. It also extrapolates smoothly to the standard perturbative α s ( E ) at higher energies. Our results indicate that BEC dimension can be considered as an alternative approach to the short-range correlations between hadrons.

Measurement of strong coupling constant from transverse momentum

2009 ◽  
Vol 87 (11) ◽  
pp. 1151-1158 ◽  
Author(s):  
Alireza Sepehri ◽  
Tooraj Ghaffary ◽  
Mohammad Ebrahim Zomorrodian
Keyword(s):  
Strong Coupling ◽  
Clustering Algorithm ◽  
Center Of Mass ◽  
Parton Model ◽  
Energy Scale ◽  
Strong Coupling Constant ◽  
Event Shape ◽  
Coupling Constant ◽  
Center Of Mass Energy ◽  
Gluon Bremsstrahlung

Data from e+e– annihilation into hadrons at the center of mass energy of 60 GeV are used to study the distribution of momentum components with respect to the jet axis. At high energies, the gluon emission that leads to three jet structures represents a gross violation of the parton model without gluons and finds a most natural interpretation if gluon bremsstrahlung is included. The coupling constant, αs, is measured by two different methods, first by employing the jet clustering algorithm introduced by the JADE group. Using this method, the strong coupling constant is found to be 0.123 ± 0.004. Next, from the event shape distributions, we extract the strong coupling constant, αs, and test its evaluation with energy scale. The results are consistent with the running of αs, expected from QCD predictions. Averaging over different observables, the value of αs is determined to be 0.121 ± 0.007.

scholarly journals The QCD strong coupling constant at low energies: a non-extensive treatment

2021 ◽  
Vol 57 (2) ◽  
Author(s):  
H. Nematollahi ◽  
K. Javidan ◽  
M. M. Yazdanpanah
Keyword(s):  
Strong Coupling ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Low Energies

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

scholarly journals Strong coupling constant from moments ofquarkonium correlators

2019 ◽  
Author(s):  
Peter Petreczky
Keyword(s):  
Strong Coupling ◽  
Strong Coupling Constant ◽  
Coupling Constant

scholarly journals EMC effect at small Bjorken x values

2019 ◽  
Vol 204 ◽  
pp. 05002
Author(s):  
A. Kotikov ◽  
B. Shaikhatdenov ◽  
P. Zhang
Keyword(s):  
Strong Coupling ◽  
Gluon Density ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Emc Effect ◽  
Bjorken X

The Bessel-inspired behavior of parton densities at small Bjorken x values is used along with “frozen” and analytic modifications of the strong coupling constant [1] to study the so-called EMC effect. Among other results, this approach allowed predicting small x behavior of the gluon density in nuclei.

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