scholarly journals Production and polarization of prompt ϒ(nS) in the improved color evaporation model using the kT -factorization approach

2019 ◽  
Vol 99 (3) ◽  
Author(s):  
Vincent Cheung ◽  
Ramona Vogt
Keyword(s):  
Factorization Approach ◽  
Evaporation Model

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.

Evaporation model of cluster scattering from surfaces

1994 ◽  
Vol 100 (5) ◽  
pp. 3911-3924 ◽  
Author(s):  
Nikola Marković ◽  
Jan B. C. Pettersson
Keyword(s):  
Evaporation Model
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