Production of ${\eta }^{\mathrm{\prime }}$ from Thermal Gluon Fusion

We study the production of ${\eta }^{\mathrm{\prime }}$ from hadronizing thermal gluons using recently proposed ${\eta }^{\mathrm{\prime }}-g-g$ effective vertex. The ${\eta }^{\mathrm{\prime }}$ yield is found to be sensitive to the initial condition. At RHIC and LHC, the enhancement is large enough to be easily detected.