Precision measurements of branching fractions for ${\psi }^{\prime }\to {\pi }^{0}J\psi$ and $\eta J\psi$

M. Ablikim, M. N. Achasov, O. Albayrak +342

We present a precision study of the $\psip\toπ^0 J/ψ$ and $\eta J/\psi$ decay modes. The measurements are obtained using $106\times 10^6$ ${\psi }^{\prime }$ events accumulated with the BESIII detector a…