Unitarity bound for gluon shadowing

Details Unitarity bound for gluon shadowing Unitarity bound for gluon shadowing

2008-11-13

arxiv.org/abs/0811.2210v1

Phys.Rev.C79:064906,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 4 figures

Scientific paper

10.1103/PhysRevC.79.064906

Although at small Bjorken x gluons originated from different nucleons in a nucleus overlap in the longitudinal direction, most of them are still well separated in the transverse plane, therefore cannot fuse. For this reason the gluon density in nuclei cannot drop at small x below a certain bottom bound, which we evaluated in a model independent manner assuming the maximal strength of gluon fusion. We also calculated gluon shadowing in the saturated regime using on the Balitsky-Kovchegov equation, and found the nuclear ratio to be well above the unitarity bound. The recently updated analysis of parton distributions in nuclei \cite{eps08} including RHIC data on high-pT hadron production at forward rapidities, led to astonishingly strong gluon shadowing, which is far beyond the unitarity bound. This indicates a misconception in the interpretation of the nuclear suppression observed at HRIC.

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