Partonic Picture of Nuclear Shadowing at Small x

Details Partonic Picture of Nuclear Shadowing at Small x Partonic Picture of Nuclear Shadowing at Small x

1997-05-06

arxiv.org/abs/hep-ph/9705250v1

Nucl.Phys. A637 (1998) 79-106

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 two-column pages in RevTeX with 9 eps figures

Scientific paper

10.1016/S0375-9474(98)00210-3

We investigate the nuclear shadowing mechanism in the context of perturbative QCD and the Glauber multiple scattering model. Using recent HERA data on nucleon structure function at small $x$, we put stringent constrains on the nucleon gluon density in the double-logarithm approximation. We suggest that the scaling violation of the nucleon structure function in the region of small $x$ and semihard scale $Q^2$ can be reliably described by perturbative QCD which is a central key to the understanding of the scale dependence of the nuclear shadowing effect. Our results indicate that while the shadowing of the quark density arises from an interplay between the ``soft'' and semihard QCD processes, the gluon shadowing is largely driven by a perturbative shadowing mechanism. We demonstrate that the gluon shadowing is a robust phenomenon at large $Q^2$ and can be unambiguously predicted by perturbative QCD.

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