Measurement of the $\hat{I}\cdot$ transition form factor through $\hat{I}{\cdot }^{\prime }\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\hat{I}\cdot$ decay

BESIII Collaboration, M. Ablikim, M. N. Achasov +678

Based on a sample of $(1.0087\pm 0.0044)\times 10^{10}$ $J/\ddot{I}ˆ$ events collected at BESIII, the transition form factor of the $\hat{I}\cdot$ meson is extracted by analyzing $J/ψ\toγη',~η'\t…