Constraints on nuclear gluon densities from J/psi data
High Energy Physics - Phenomenology
2008-12-18 v1
Abstract
The gluon density in nuclei, G^A(x), is poorly constrained at all x from the current DIS and Drell-Yan data. In this paper, we point out that J/psi production measured in proton-nucleus collisions at sqrt(s)=38.8 GeV by the E866 collaboration puts stringent constraints on the x-dependence of the G^W/G^Be ratio in the x=0.02-0.1 range. The E866 data suggest a rather mild x-dependence of G^W/G^Be, and consequently tend to favour DS and HKM sets, rather than the DSg, EKS, and EPS parametrizations which exhibit a large shadowing and anti-shadowing.
Cite
@article{arxiv.0804.2802,
title = {Constraints on nuclear gluon densities from J/psi data},
author = {Francois Arleo},
journal= {arXiv preprint arXiv:0804.2802},
year = {2008}
}
Comments
7 pages, 1 figure