scholarly journals A calorimetric measurement of the strong coupling constant in electron-positron annihilation at a center-of-mass energy of 91.6 GeV

1994 ◽  
Author(s):  
Saul Gonzalez Martirena
Keyword(s):  
Positron Annihilation ◽  
Strong Coupling ◽  
Center Of Mass ◽  
Strong Coupling Constant ◽  
Calorimetric Measurement ◽  
Coupling Constant ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

Hadron Production by Electron-Positron Annihilation at 4-GeV Center-of-Mass Energy

1973 ◽  
Vol 30 (23) ◽  
pp. 1189-1192 ◽  
Author(s):  
A. Litke ◽  
G. Hanson ◽  
A. Hofmann ◽  
J. Koch ◽  
L. Law ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Center Of Mass ◽  
Hadron Production ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

Hadron Production by Electron-Positron Annihilation at 4-GeV Center- of-Mass Energy.

1973 ◽  
Vol 30 (26) ◽  
pp. 1349-1349 ◽  
Author(s):  
A. Litke ◽  
G. Hanson ◽  
A. Hofmann ◽  
J. Koch ◽  
L. Law ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Center Of Mass ◽  
Hadron Production ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

Hadron Production by Electron - Positron Annihilation at 5 GeV Center - of Mass Energy

1974 ◽  
Vol 32 (8) ◽  
pp. 432-435 ◽  
Author(s):  
G. Tarnopolsky ◽  
J. Eshelman ◽  
M. E. Law ◽  
J. Leong ◽  
H. Newman ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Center Of Mass ◽  
Hadron Production ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

Muon pair production by electron-positron annihilation at 4 GeV center-of-mass energy

1973 ◽  
Vol 8 (18) ◽  
pp. 1020-1024
Author(s):  
J. Feller ◽  
A. Litke ◽  
R. Madaras ◽  
G. Hanson ◽  
J. Leong ◽  
...  
Keyword(s):  
Pair Production ◽  
Positron Annihilation ◽  
Center Of Mass ◽  
Mass Energy ◽  
Muon Pair ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
Muon Pair Production

Observation of antideuteron production in electron-positron annihilation at 10 GeV center of mass energy

1985 ◽  
Vol 157 (4) ◽  
pp. 326-332 ◽  
Author(s):  
H. Albrecht ◽  
U. Binder ◽  
G. Harder ◽  
H. Hasemann ◽  
A. Philipp ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Center Of Mass ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

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 Double Charmonium Productions in Electron-Positron Annihilation Using Bethe-Salpeter Approach

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
Hluf Negash ◽  
Shashank Bhatnagar
Keyword(s):  
Positron Annihilation ◽  
Cross Sections ◽  
Production Cross ◽  
Center Of Mass ◽  
Theoretical Models ◽  
Final States ◽  
Charmonium Production ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

We calculate the double charmonium production cross-section within the framework of 4×4 Bethe-Salpeter Equation in the electron-positron annihilation, at center of mass energy s=10.6GeV, that proceeds through the exchange of a single virtual photon. In this calculation, we make use of the full Dirac structure of 4D BS wave functions of these charmonia, with the incorporation of all the Dirac covariants (both leading and subleading). The calculated cross-sections for the double charmonium productions for final states, (J/Ψ,ηc), (Ψ′,ηc), (J/Ψ,ηc′), and (Ψ′,ηc′), are close to experimental data and in broad agreement with results of other theoretical models.

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