$\Upsilon(1S) \to \eta^\prime + X $ decays

We present an improved measurement of the $\eta ^\prime$ spectra in $\Upsilon(1S)$ decays, performed using 1.2 $\mathrm{fb}^{-1}$ of data taken at the $\Upsilon(1S)$ center-of-mass energy with the CLEO-III detector at CESR. The improved measurement of the end point of the $\eta ^\prime$ spectrum from the $\Upsilon(1S) \to ggg$ decay will allow a more precise parametrization of the $\eta^\prime$ vertex function and will have implications for our understanding of the inclusive $B \to \eta ^{\prime} X_s$ decay.