${\eta }^{\mathrm{\prime }}-g^{\ast }-g$ Transition Form Factor with Gluon Content Contribution Tested

We study the ${\eta }^{\mathrm{\prime }}-g^{\ast }-g$ transition form factor by using the ${\eta }^{\mathrm{\prime }}$ wave function constrained by the experimental data on the ${\eta }^{\mathrm{\prime }}-{\gamma }^{\ast }-\gamma$ transition form factor provided by CLEO and L3 . We also take into account the contribution of the possible gluonic content of the ${\eta }^{\mathrm{\prime }}$ meson.