scholarly journals Comparison of the color-evaporation model and the nonrelativistic QCD factorization approach in charmonium production

2005 ◽  
Vol 72 (1) ◽  
Author(s):  
Geoffrey T. Bodwin ◽  
Eric Braaten ◽  
Jungil Lee
Keyword(s):  
Factorization Approach ◽  
Charmonium Production ◽  
Evaporation Model ◽  
Qcd Factorization ◽  
Nonrelativistic Qcd

scholarly journals NUCLEAR SHADOWING EFFECTS ON CHARMONIUM PRODUCTION IN QCD

1998 ◽  
Vol 13 (06) ◽  
pp. 453-463 ◽  
Author(s):  
C. PAJARES ◽  
C. A. SALGADO ◽  
Yu. M. SHABELSKI
Keyword(s):  
Experimental Data ◽  
Structure Functions ◽  
Nuclear Medium ◽  
Color Singlet ◽  
Separate Study ◽  
Factorization Approach ◽  
Parton Distributions ◽  
Charmonium Production ◽  
Evaporation Model ◽  
Nonrelativistic Qcd

It is shown that the effects on charmonium production of the modification of nucleon parton distributions inside nuclei are similar in the factorization approach based on nonrelativistic QCD and in the color evaporation model. In the first model, a separate study of the color octet and color singlet contributions to the yields of the various charmonium states as well as the contributions of these states to the total J/ψ production is performed. It is found that a clear xF dependence of these contributions which, together with an overall normalization given by absorption of the pre-resonant [Formula: see text] state inside the nuclear medium, can reproduce experimental data a for moderate xF. However, at large xF, there is bigger suppression that cannot be fit by this overall normalization together with the shadowing of structure functions.

scholarly journals CHARMONIUM POLARIZATION AT THE TEVATRON

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 483-485
Author(s):  
JUNGIL LEE
Keyword(s):  
Factorization Approach ◽  
Qcd Factorization ◽  
Nonrelativistic Qcd

The current issues on the polarization of prompt J/ψ at the Tevatron is discussed. The prediction based on the nonrelativistic QCD factorization approach agrees with measurements from the CDF collaboration at intermediate values of pT, but disagrees at the large values of pT measured.

scholarly journals INCLUSIVE PRODUCTION OF FOUR CHARM HADRONS AT B-FACTORIES

2006 ◽  
Vol 21 (04) ◽  
pp. 922-925
Author(s):  
Daekyoung Kang ◽  
Jungil Lee
Keyword(s):  
Scattering Amplitude ◽  
Belle Collaboration ◽  
Inclusive Production ◽  
Hard Scattering ◽  
Factorization Approach ◽  
Qcd Factorization ◽  
Nonrelativistic Qcd ◽  
Theoretical Predictions ◽  
Perturbative Corrections

Measurements by the Belle Collaboration of the exclusive J/ψ + ηc and inclusive [Formula: see text] productions in e+e- annihilation differ substantially from theoretical predictions based on the nonrelativistic QCD factorization approach. In order to test if such a discrepancy is originated from the large perturbative corrections to the hard-scattering amplitude, we study inclusive production of four charm hadrons in e+e- annihilation at B factories.

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