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The cross sections of $e^+e^- \rightarrow \pi Z_c(3900) \rightarrow \pi\piJ/\psi$ and $e^+e^- \rightarrow \pi Z_c(3900) \rightarrow \pi D\bar{D}^{*}$have been measured by BESIII experiment. We try to perform a combined fit tothe cross sections with one Breit-Wigner function, the fit results show thestructure's mass and width are $M=(4232\pm5)$ MeV/$c^2$, $\Gamma=(65\pm21)$MeV. The ratio $\frac{\mathcal{B}(Z_c(3900)\rightarrowD\bar{D}^{*})}{\mathcal{B}(Z_c(3900)\rightarrow\pi J/\psi)}$ is determined tobe $(16\pm6)$. We also try to fit the cross sections with two Breit-Wignerfunctions, while we can't come to any definitive conclusions about the secondstructure. More measurements are desired to improve the understanding of$e^+e^- \rightarrow \pi Z_c(3900)$ line shape.

acta physica polonica. b

Combined fit to the cross sections of $e^+e^- \rightarrow \pi Z_c(3900)  \rightarrow \pi\pi J/\psi$ and $e^+e^- \rightarrow \pi Z_c(3900) \rightarrow  \pi D\bar{D}^{*}$