$\mathrm{{\rm Y}}(1S)-->\gamma ({\eta }^{\mathrm{\prime }},\eta ,f_2(1270))$ decays

$\mathrm{{\rm Y}}(1s)\to \gamma ({\eta }^{\mathrm{\prime }},\eta ,f_2(1270))$ are studied by an approach in which the glueball components of these mesons play dominant role. Strong dependence on quark mass has been found in the decays $(J/\psi, \Upsilon(1s))\to\gamma(\eta’,\eta)$\mathrm{.}Verysmalldecayratesof$\Upsilon(1s)\to\gamma(\eta’,\eta)$ are predicted. d-wave dominance has been found in $\mathrm{{\rm Y}}(1s)\to \gamma f_2(1270)$, which leads to larger $B(\mathrm{{\rm Y}}(1s)\to \gamma f_2(1270))\mathrm{.}$