At the invariant mass spectrum of hcπ±\documentclass[12pt]{minimal}
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\begin{document}$$h_c\pi ^\pm $$\end{document} a new resonance Zc(4020)\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(4020)$$\end{document} has been observed, however, the previously confirmed Zc(3900)\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(3900)$$\end{document} does not show up at this channel. In this paper we assume that Zc(3900)\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(3900)$$\end{document} and Zc(4020)\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(4020)$$\end{document} are molecular states of DD¯∗(D∗D¯)\documentclass[12pt]{minimal}
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\begin{document}$$D\bar{D}^*(D^{*} \bar{D})$$\end{document} and D∗D¯∗\documentclass[12pt]{minimal}
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\begin{document}$$D^*\bar{D}^*$$\end{document}, respectively, then we calculate the transition rates of Zc(3900)→hc+π\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(3900)\rightarrow h_c+\pi $$\end{document} and Zc(4020)→hc+π\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(4020)\rightarrow h_c+\pi $$\end{document} in the light-front model. Our results show that the partial width of Zc(3900)→hc+π\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(3900)\rightarrow h_c+\pi $$\end{document} is only three times smaller than that of Zc(4020)→hc+π\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(4020)\rightarrow h_c+\pi $$\end{document}. Zc(4020)\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(4020)$$\end{document} seems to be a molecular state, so if Zc(3900)\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(3900)$$\end{document} is also a molecular state it should be observed in the portal e+e-→hcπ±\documentclass[12pt]{minimal}
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\begin{document}$$e^+e^-\rightarrow h_c\pi ^\pm $$\end{document} as long as the database is sufficiently large; to the contrary if the future more precise measurements still cannot find Zc(3900)\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(3900)$$\end{document} at hcπ±\documentclass[12pt]{minimal}
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\begin{document}$$h_c\pi ^\pm $$\end{document} channel, the molecular assignment to Zc(3900)\documentclass[12pt]{minimal}
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\begin{document}$$Z_c(3900)$$\end{document} should be ruled out.
