Radiative decay widths of ground and excited states of vector charmonium and bottomonium

Hluf Negash, Shashank Bhatnagar

In this work we study the radiative decay widths of vector quarkonia for the process of $J/\psi (nS)\to {\eta }_c(nS)\gamma$ and ${\rm Y}(nS)\to {\eta }_b(nS)\gamma$ (for principal quantum numbe…