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

Jamal Jalilian-Marian·Sangyong Jeon
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Abstract

Using the recently proposed $gg --> eta'$ effective vertex, we investigate the production of $η'$ from gluon fusion in $pA$ collisions. We show that measuring $η'$ production cross-section at moderate $x_{η'}$ 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, $η'$ is an excellent probe of the Color Glass Condensate.

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Jamal Jalilian-Marian, Sangyong Jeon. 2001-10-31. Probing Gluons in Nuclei: the Case of $η'$. https://doi.org/10.1103/physrevc.65.065201

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