J/[psi] suppression in p-A collisions from charm quark energy loss in cold nuclear matter

The energy loss effect of charm quarks in cold nuclear matter on J/[psi] suppression in p-A collisions is studied. By means of two parametrizations of quark energy loss, the leading-order computations for super(J)/[psi] production cross section ratios super(R) sub()WFe)/(Be)xF) are presented and com...

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Bibliographic Details
Published in:Journal of physics. G, Nuclear and particle physics Nuclear and particle physics, 2016-02, Vol.43 (2)
Main Authors: Song, L H, Duan, C G
Format: Article
Language:English
Subjects:
Charm (particle physics)
Collisions
Color
Cross sections
Mathematical models
Nuclear matter
Octets
Quarks
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Summary:The energy loss effect of charm quarks in cold nuclear matter on J/[psi] suppression in p-A collisions is studied. By means of two parametrizations of quark energy loss, the leading-order computations for super(J)/[psi] production cross section ratios super(R) sub()WFe)/(Be)xF) are presented and compared with the selected E866 experimental data, with the cc remaining colored on its entire path in the medium. It is found that the energy loss of the color octet cc is an important effect in J/[psi] suppression; however, whether it is linear or quadratic with the path length cannot be determined. The successful description of J/[psi] suppression in 0.2 < x sub(F) 0.65 gives the charm quark mean energy loss per unit path length alpha =1.49 + or - 0.37 GeV/fm. Using the same quark energy loss model, we further give the phenomenological analysis at the leading order for J/[psi] production cross section ratios as a function of y for the Large Hadron Collider experimental data
ISSN:0954-3899
1361-6471
DOI:10.1088/0954-3899/43/2/025101