\Upsilon(1s)-->\gamma(\eta',\eta) decays

The decays of $\Upsilon(1s)\to\gamma(\eta',\eta)$ are studied by an approach which has successfully predicted the ratio $\frac{\Gamma(J/\psi\to\gamma\eta')}{\Gamma(J/\psi\to\gamma\eta)}$. Strong dependence on quark mass has been found in the decays $(J/\psi, \Upsilon(1s))\to\gamma(\eta',\eta)$. Very small decay rates of $\Upsilon(1s)\to\gamma(\eta',\eta)$ are predicted.