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

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