A modified explanation of cold nuclear matter effects on J/ψ production in p+A collisions  

作　　者：刘植凤 

机构地区：[1]Institute of Geophysics, Shijiazhuang Economic University

出　　处：《Chinese Physics C》2015年第8期56-61,共6页中国物理C（英文版）

基　　金：Supported by National Nature Science Foundation of China(10575028)

摘　　要：A modified explanation of the cold nuclear matter （CNM） effects on J/ψ production in p＋A collisions is presented in this paper. The advantage of the modified explanation is that all the CNM effects implemented in this model have clear physical origins and are mostly centered on the idea of multiple parton scattering. With the CNM effects presented in this paper, we calculated the nuclear modification factor RpA in J/ψ production under different collision energies. The results are compared with the corresponding experiment data and the factors calculated with classic nuclear effects. The factors calculated with CNM effects presented in this paper can accurately reproduce almost all existing J/ψ measurements in p-A collisions, which is much better than results obtained with the factors calculated with classic nuclear effects. The new model is therefore a more suitable approach to explain CNM effects in the hardproduction of quarkonium.A modified explanation of the cold nuclear matter （CNM） effects on J/ψ production in p＋A collisions is presented in this paper. The advantage of the modified explanation is that all the CNM effects implemented in this model have clear physical origins and are mostly centered on the idea of multiple parton scattering. With the CNM effects presented in this paper, we calculated the nuclear modification factor RpA in J/ψ production under different collision energies. The results are compared with the corresponding experiment data and the factors calculated with classic nuclear effects. The factors calculated with CNM effects presented in this paper can accurately reproduce almost all existing J/ψ measurements in p-A collisions, which is much better than results obtained with the factors calculated with classic nuclear effects. The new model is therefore a more suitable approach to explain CNM effects in the hardproduction of quarkonium.

关 键 词：quantum chromodynamics cold nuclear matter effects quark energy loss effect dynamical shadowingeffect gluon saturation 

分 类 号：O572.33[理学—粒子物理与原子核物理]