Transverse momentum dependent gluon fragmentation functions from $J/\psi \pi$ production at $e^{+}{e}^{-}$ colliders

Guang-Peng Zhang

The back-to-back $J/\psi$ and $\pi$ associated production at $e^{+}{e}^{-}$ colliders is proposed to detect the gluon transverse momentum dependent(TMD) fragmentation functions. TMD factoriz…