Radiative decays of bottomonia into charmonia and light mesons

Ying-Jia Gao, Yu-Jie Zhang, Kuang-Ta Chao

In the framework of nonrelativistic QCD, we study the radiative decays of bottomonia into charmonia, including ${\rm Y}\to {\chi }_{cJ}\gamma$, ${\rm Y}\to {\eta }_c\gamma$, ${\eta }_b\to J/\psi \gamma$, and ${\chi }_{bJ}\to J/\psi \gamma$. We…