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

Abstract

${\rm Y}(1s)\to \gamma ({\eta }^{\prime },\eta ,f_2(1270))$ 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 $(J/\psi ,{\rm Y}(1s))\to \gamma ({\eta }^{\prime },\eta )$. Very small decay rates of ${\rm Y}(1s)\to \gamma ({\eta }^{\prime },\eta )$ are predicted. d-wave dominance has been found in ${\rm Y}(1s)\to \gamma f_2(1270)$, which leads to larger $B({\rm Y}(1s)\to \gamma f_2(1270)).$

3 pages. To be published in the proceedings of DPF - 2009, Detroit, MI, July 2009, eConf C090726