Precision measurement of the branching fractions of ${\eta }^{\prime }$ decays

M. Ablikim, M. N. Achasov, S. Ahmed +460

Based on a sample of $(1310.6\pm 7.0)\times 10^{6}J/\psi$ events collected with the BESIII detector, we present measurements of $J/\psi$ and ${\eta }^{\prime }$ absolute branching fractions usin…