Probing Gluons in Nuclei: the Case of $η'$

Details Probing Gluons in Nuclei: the Case of $η'$ Probing Gluons in Nuclei: the Case of $η'$

2001-10-31

arxiv.org/abs/hep-ph/0110417v1

Phys.Rev. C65 (2002) 065201

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 3 figures

Scientific paper

10.1103/PhysRevC.65.065201

Using the recently proposed $gg --> eta'$ effective vertex, we investigate the production of $\eta'$ from gluon fusion in $pA$ collisions. We show that measuring $\eta'$ production cross-section at moderate $x_{\eta'}$ yields direct information on the small $x$ gluon distribution function of the nucleus. At RHIC, the smallest accessible $x$ turns out to be $O(10^{-5})$ and at LHC, it is $O(10^{-8})$. Therefore, $\eta'$ is an excellent probe of the Color Glass Condensate.

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