Unitarity bound for gluon shadowing - High Energy Physics - PhenomenologyReport as inadecuate




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



Author: B.Z. Kopeliovich, E. Levin, I.K. Potashnikova, Ivan Schmidt

Source: https://arxiv.org/







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