On leptonic width of $X(4260)$

Qin-Fang Cao, Hong-Rong Qi, Guang-Yi Tang +2

New measurements on cross sections in $e^{+}{e}^{-}\to J/\psi {\pi }^{+}{\pi }^{-}$, $h_c{\pi }^{+}{\pi }^{-}$, $D^0{D}^{\ast -}{\pi }^{+}+c.c.$, $\psi (2S){\pi }^{+}{\pi }^{-}$, $\omega {\chi }_{c0}$ and $J/\psi \eta$ channels have been carried out by BESIII, Belle a…