Perturbative Gluon Shadowing in Heavy Nuclei
K. J. Eskola, Jianwei Qiu, Xin-Nian Wang
Abstract
We study how much gluon shadowing can be perturbatively generated through the modified QCD evolution in heavy nuclei. The evolution of small-x gluons is investigated within the semiclassical approximation. The method of characteristics is used to evaluate the shadowed distributions in low-Q and small-x region. In solving the modified evolution equation, we model in simultaneously fusions from independent constituents and from the same constituent, both in a proton and in a large loosely bound nucleus of A 200. In addition to the actual distributions at small x, we study the ratios of the distributions at an initial scale Q0 = 2 GeV, and show that a strong nuclear shadowing can follow from the modified QCD evolution.
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